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  mesial-distal
     After 40# root cancal preparation, the decrement of thickness of hard tissue in Labial-lingial direction was 16.5% and that in Mesial-Distal direction was 18.7%.
     40#号扩锉完成后,唇舌向牙体硬组织厚度减少了16.5%,近远中向牙体硬组织厚度减少了18.7%。
短句来源
     When the masticated loads were 2 kg,4 kg,6 kg,8 kg,measure displacement of the abutment and calculate displacement,inclination,and torsion of the abutment in mesial-distal,labial-lingual and vertical directions respectively. Then analyze the effect of retention on displacement,inclination and torsion of abutment.
     在双侧后牙区放置食物片的咬合状态下,负载2 kg、4 kg、6 kg、8 kg咀嚼力时,测量并计算出基牙在近远中向、唇舌向、垂直向的位移、倾斜、扭转量,统计分析不同固位力大小对基牙位移影响的意义。
短句来源
     RESULTS: The displacement, inclination, and torsion of the abutment movements in the mesial-distal, bucco-lingual and occluso- gingival directions all had statistical significance(P<0.05).
     结果:3种附着体义齿基牙的近远中向、颊舌向、垂直向的位移、倾斜、扭转均有统计学差异(P<0.05)。
短句来源
     According to the plane coordinate in each image,buccolingual direction was presented as X axis,mesial-distal direction as Y axis and occlusogingival direction as Z axis.
     根据各层图上建立的平面坐标,设颊舌向为X轴,近远中向为Y轴,龈向为Z轴。
短句来源
     Besides, mesial-distal root canal walls of mandibular incisor teeth are thin.
     同时下颌切牙根管壁近远中向薄。
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  “近远”译为未确定词的双语例句
     26.22% mandibular incisors and 31.45% mandibular canines curve were in mesiodistal directions, 7.01% mandibular incisors and 18.87% mandibular canines curve were in buccolingual directions.
     26.22%的下颌切牙和31.45%的 下颌尖牙出现近远中向弯曲,7.01%的下颌切牙和18.87%的下颌尖牙出现颊舌向弯曲。
短句来源
     The proportion of maxillary center incisors,maxillary lateral incisors,maxillary canines curved in mesiodistal were 11.17%,16.19% and 21.43%,in labio-lingual were 39.59%,40.00% and 29.59%,both in labiolingual and mesiodistal directions were 4.60%,35.24% and 24.49%.
     上颌中切牙、侧切牙和尖牙只出现近远中向弯曲的比例为11.17%、16.19%、21.43%,只出现唇舌向弯曲的比例为39.59%、40.00%、29.59%,近远中向和唇舌向都存在弯曲的比例为4.60%、35.24%、24.49%。
短句来源
     26.22% mandibular incisors and 31.45% mandibular canines curve in mesiodistal, 7.01% mandibular incisors and 18.87% mandibular canines curve in buccolingual.
     26.22%的下颌切牙和31.45%的下颌尖牙出现近远中向弯曲,7.01%的下颌切牙和18.87%的下颌尖牙出现颊舌向弯曲。
短句来源
     and the displacement value (2) on the buccal side was 0.0496μm, lingual side 0.0467μm and mesio-distal side 0.0484μm.
     (c)龈向———颊侧为0.0496μm ,舌侧为0.0467μm ,近远中向为0.0484μm。
短句来源
     ③ The angle between medical and distal roots of the first mandibular molars was 11.5°±3.5°(mean).
     ③下颌第一磨牙近远中根分叉度平均为 11.5°± 3.5°。
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  相似匹配句对
     10.near to far.
     (10)从
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     On the Elegance and Vulgarity of Ci Poetry
     俗话词论
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     The Outer Beach
    
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     Is It Far?
     路程吗?
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     caeruleum.
     caeruleum缘。
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  mesial-distal
Mesial-distal and buccal-lingual dimensions of 1 266 hominoid teeth found in Yuanmou of Yunnan Province during the period of 1986 and 1988 have been measured.
      
One thin section (150?μm), in mesial-distal direction, of each restoration, was examined under metallographic microscope to determine the quality of internal adaptation.
      
The material consisted of 18 extracted premolar teeth that were cut in mesial-distal direction and pairwise assigned to either test or control samples in an experimental caries model.
      
The limited mesial-distal ridge length further limited the space for papillae.
      


The purpose of this investigation is to study the possibility and condition for a lunar probe to hit or to fly over, at close range, any given region on the surface of the moon. We limit the ballistic speed of the vehicle to 11.2 km/sec and require that the height at the last burn out point should be about a few hundred kilometres. Six definite regions on the surface of the moon are considered as the objectives of these flights. Four regions lie on the great circle where the orbital plane of the moon cuts the...

The purpose of this investigation is to study the possibility and condition for a lunar probe to hit or to fly over, at close range, any given region on the surface of the moon. We limit the ballistic speed of the vehicle to 11.2 km/sec and require that the height at the last burn out point should be about a few hundred kilometres. Six definite regions on the surface of the moon are considered as the objectives of these flights. Four regions lie on the great circle where the orbital plane of the moon cuts the lunar surface. They are designated as the "near", "remote", "east", and "west" points. For these points, only trajectories in the orbital plane of the moon have been considered. The other two regions, namely, the poles of the aforesaid great circle, are called the "north" and "south" points respectively. In the preliminary survey of the possible trajectories, the approximate method of assuming the earth-moon space as divided into two by a sphere of action of radius 66000 km around the moon has been employed. The trajectory may then be considered to consist of several sections, each one of which is determined by the laws of two-body problem. From considerations on the permissible angular momentum of the orbit, it has been possible to derive limiting values for the velocity of hitting and the angle of incidence in the case of impact trajectories. For reconnaissance trajectories, we try to find out the allowable perilunar distance and velocity as well as how close may the perilunar point of the trajectory be brought to the surface of the moon. From preliminary investigation by the approximate method of sphere of action, we have come to the following conclusions: A. For impact trajectories: 1) To hit either the near or the remote point, the vehicle must be approaching the moon from the east side. With velocity of impact somewhere in the range 160—180km/min, the probe may hit these points at an angle of incidence of 30° or greater. 2) Vertical impact is possible only at the east point with the velocity of hitting at slightly less than 160 km/min. 3) The west point may be hit by a lunar probe, but only at grazing incidence. 4) The trajectories for hitting the north and the south points could be mirror images of each other. These points may be hit at an angle of incidence of about 60°, at a speed of less than 160 km/min. B. For reconnaissance trajectories: 1) Over the near and the remote points, there is a whole series of symmetrical orbits in which the vehicle would be sure to return to the neighbourhood of the earth. When the perilunar velocity is about 100 km/min, the distance of close approach to the centre of the moon may be no more than 5000 km. We can make the trajectory come in contact with the surface of the moon, if we allow the perilunar velocity to be increased to 160 km/min. 2) With perilunar distance over 30000 km, it is possible for the vehicle to fly horizontally over the east point of the moon. Such reconnaissance flight is possible over the west point, but the vehicle has to be so low that the orbit becomes identical with the impact trajectory grazing the west point. 3) When the perilunar point of the orbit may be permitted to deviate about 45° from the zenith of the east or the west point, we can still have reconnaissance trajectories that will bring the vehicle back to the neighbourhood of the earth. 4) When we consider only trajectories whose motion inside the sphere of action is in a plane perpendicular to the earth-moon direction, we could have symmetrical orbits with horizontal flight over the north or the south point at a distance of about 24000 km from the centre of the moon. With permissible values at the moon for different definite points, the path of the vehicle is traced backward in time to verify if it did pass by the vicinity of the earth with reasonable speed. If so, the position and velocity of the vehicle near the earth are taken as the initial values at the last burn out point, and the impact or reconnaissance trajectory is computed once again. In such computations the attractions of both the moon and the earth are taken into account by the method of numerical integration. The trajectories thus obtained are listed in Tables 5, 6, and 7.

在月球表面上考虑了六个定点,它们是自道面内的近、远、东、西四点和此外的南北两点。为了要找到可以实现用火箭击中和航测这六点的轨道,我们以在月面定点上可以容许的初值为轨道出发点,倒推出火箭在地球附近时的位置和速度。月面定点上的初值是依据火箭大约在地面上200公里高空以第二宇宙速度发射的假定选取的。所用方法是按作用范围和简单的角动量和能量守恒的原理来考虑的。计算结果表明,火箭从地面上以通常的高度和速度发射能够击中这六个定点:东点可以垂直击中,西点只能切向击中。航测这六个定点,都可以找到有去有回的轨道,航测远、近、南、北四点还可以有对称的轨道。航测远、近点可以和月面接近到任意距离,航测其他各点,距离便要远些,约为二、三万公里。

为了区分切诊所得的各种脉波信息,研制了二种组合式脉波传感器。“平面型”的检测部分由排列在同一平面上的三个平面探头组成,而“中突型”则由一个凸状探头位于二个平面探头之间组成。当组合传感器置于取脉区时,桡动脉被探头(尤其是凸起部)加压以至阻断,并被强制地划分成三个具有生理意义的小区。因此,脉波信息就可以按压阻点及其近、远心侧区分检测出来。与广泛采用的单探头脉波传感器相比,组合式脉波传感器(特别是中突型)具有许多特点。正如著者证实:这种传感器可用来监测桡动脉内血流状态,比较压阻点近、远心侧脉波的差别,获得有关脉波传播速度的信息,鉴别脉波的拍-拍变化与伪差,以及大致估计整体外周阻力与手部外周阻力对脉波形态的影响。

Furcation morphology of 103 permanent molar teeth(only first and second molars)in human has been observed by the measuring methods to evaluate whether furcation morphology mayinfluence the periodontal treatment by using curettage. It was shown that the buccal furcation demension(of angle)of maxillary teeth tended to be smaller than either themesiopalatal or distopalatal,and so did the mesiodistal furcation demension of mandibular, teeth.Furthermore,the blade face diameter of the domestic curettes is usually...

Furcation morphology of 103 permanent molar teeth(only first and second molars)in human has been observed by the measuring methods to evaluate whether furcation morphology mayinfluence the periodontal treatment by using curettage. It was shown that the buccal furcation demension(of angle)of maxillary teeth tended to be smaller than either themesiopalatal or distopalatal,and so did the mesiodistal furcation demension of mandibular, teeth.Furthermore,the blade face diameter of the domestic curettes is usually too wide to enter furca tion, which makes it unlikely that curette used-alone will achieve adequate preparation of this area according to the routine procedures,It was also found that there are almost always concavities on the mesiobuCcal furcal aspect Of maxillary teeth and on mesial and distal furcal aspect of mandibular teeth,The maximal depth ofthese concavities is up to 2mm.The results may be considered to be one of the important reasons wh-y furcation involvement is not easy to eliminate.

本文对103枚人类恒磨牙(第一、二恒磨牙)根分叉部形态进行了测量观察,旨在探讨其对牙周治疗的影响。结果表明,上颌近-选中颊根和下颌近-远中根根分叉角度小于上颌近中颊-腭根或远中颊腭根根分叉角度。又由于国产龈下刮治器的工作面直径较宽,当根分叉角度较小时,器械到达根分叉部受限。因此,按照常规方法常难以对根分叉部进行良好的根面预备。此外,本研究还发现人类多根牙的根面沟凹陷出现率很高,上颌牙近中颊根和下颌牙近、远中根几乎总存在根面沟凹陷,且最大深度可达2mm,因此认为,其可能是根分叉部病变难以彻底消除的重要原因之一。

 
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