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五十年
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  fifty years
     Fifty Years of English Reading Theory Research
     英语阅读理论研究五十年
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     The Fifty Years of China Petroleum Geology
     中国石油地质学五十年
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     Population Growth and Social Development—— FIFTY YEARS OF DEMOGRAPHY IN NEW CHINA Witnesses Achievements and Lessons in Development of New China
     人口发展与社会发展——《新中国人口五十年》见证新中国发展的经验教训
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     Fifty Years of Olefin Polymerization
     烯烃聚合五十年
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     Quality of Life and Need Satisfaction:A Study on Social Welfare in China for Past Fifty Years
     生活质量与需要满足:五十年来中国社会福利研究概述
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  “五十年”译为未确定词的双语例句
     Fifty-year Study of Xiangxi Miao Language (1949——1999)
     湘西苗语研究五十年(1949—1999)
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     Considering the feature affected by the strongest typhoon (on 30—31,Aug. 1939)in this port is 81.00kg/m~2 obtained from the surface weather chart.
     同时考虑到近五十年来影响本港最严重的一次台风过程(1939年8月30—31日)计算出基本风压为81.00公斤/米~2,作为特别重要或有特殊要求构筑物基本风压设计标准。
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     SUMMARY OF AGRICULTURAL SCIENTIFIC RESEARCH IN TAIWAN DURING 1895~1945
     台湾五十年(1895~1945)农业科研述要
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     Development of the Foundation Engineering Science in the 50 Years
     地基基础工程科学发展五十年
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     Nerve growth factor is discovered before more than 50 years.
     神经生长因子(nerve growth factor,NGF)的发现已经有五十年的历史。
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     Brilliant Achievements Made in the Past Fifty Years
     辉煌十年
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     50 — Year — Research On DuFu
     杜甫研究十年
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     五.
     .
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     五. The conclusion.
     、结语
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     Ten Years Development of Capital Group
     首创十年
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  fifty years
On the species-specificity of DNA: Fifty years later
      
Fifty years since launch of sputnik-the first artificial satellite of the Earth
      
Glass microspheres have been used in laser physics as hydrogen microcontainers over a period of more than fifty years.
      
The history of development, current status, and prospects for x-ray photoelectron spectroscopy are considered upon the fifty years of the method.
      
Defect of total nuclear scattering cross sections: Fifty years of the Glauber diffraction theory
      
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The monthly temperature charts of China during the period of 1909-1958 are used to analyze the secular temperature variations in China. The monthly temperature in China is classified into 5 ranks: cold (C), warm (W), slightly cold (Cw), slightly warm (Wc) and normal (N). The climatic variations of these 5 ranks of monthly temperature in China are tabulated in Table 1 and 2. From an analysis of Fig. 3-4, and Table 3, we find that the secular variations of warm and cold months. in China are definitely correlated...

The monthly temperature charts of China during the period of 1909-1958 are used to analyze the secular temperature variations in China. The monthly temperature in China is classified into 5 ranks: cold (C), warm (W), slightly cold (Cw), slightly warm (Wc) and normal (N). The climatic variations of these 5 ranks of monthly temperature in China are tabulated in Table 1 and 2. From an analysis of Fig. 3-4, and Table 3, we find that the secular variations of warm and cold months. in China are definitely correlated with the cyclic variations of solar activity. It is also found, that once after a cold or a warm period (1-3 months) appears the probablity of occurrence of same trend of temperature in the following half year will be - greater than that of the opposite trend of monthly temperature. " .

本文根据1909—1958年五十年时期内,中国逐月的温度等级分布图探讨了我国温度的多年变化。根据温度等级分布图,把中国各月温度状况分为五类:即冷月、暖月、偏冷月、偏暖月和正常月。五类温度月份出现的气候特征见表1和表2。从图3—4和表3的分析,发现50年来在我国出现的暖月和冷月与太阳活动的周期性变化有一定的关联。在我国出现一次冷期或暖期(1—3月)之后的半年内,一般仍以出现同类温度符号的机率大于相反符号的机率。

Sequences of 28 major earthquakes occurred in China have been analyzed. It is found that:(1) For the mainshoek-aftershock type of earthquake sequence, there is a relation between the "waiting time" △t of a strong aftershock (so-called, as the time interval from its preceding strong aftershock) and the time of its occurrence t (time interval from the moment of onset of the mainshock), namely,lg△t = Algt + B A=0.92, B= - 0.11(2) For a twin earthquake (two main shocks)-or a swarm of strong (more than two main shocks)...

Sequences of 28 major earthquakes occurred in China have been analyzed. It is found that:(1) For the mainshoek-aftershock type of earthquake sequence, there is a relation between the "waiting time" △t of a strong aftershock (so-called, as the time interval from its preceding strong aftershock) and the time of its occurrence t (time interval from the moment of onset of the mainshock), namely,lg△t = Algt + B A=0.92, B= - 0.11(2) For a twin earthquake (two main shocks)-or a swarm of strong (more than two main shocks) earthquakes, such a relation becomes apparent only after the occurrence of the final main shock.A preliminary discussion has been made in connection with the applications of the above result in discerning the type of earthquake sequence and prediction of strong aftershocks following the major earthquake. Furthermore, based on the principles of rheology and fracture mechanics, a preliminary theoretical explanation of the relation between lg△t and lgt was attempted.

分析了我国约五十年来发生的28个大震的余震序列。指出: 1、对于主-余震型地震序列,其强余震的“等待时间”(该强余震距上次强余震的时间)Δt与它的发生时间(距主震的时间)t遵从对数——对数线性关系: 其中:A≈0.92,B≈-0.11。 2、对于双主震或主震群型的地震序列则只有在最后一个主震发生后,Δt和t才有上述关系。 文中对上述特点在判断地震类型及预报强余震震中的应用,作了初步讨论。并利用流变学和断裂力学的观点,对这一现象作了初步的理论解释。

The developments of cyclotrons are outlined. The principle and characteristics of AVF cyclotrons are discribed. The requirements and possibility for production of short-lived, neutron deficient radionuclides, for fast neutron therapy and activation analysis using cyclotrons are discussed briefly.

五十年来,回旋加速器有了很大发展。由普通回旋加速器,逐步发展研制成了调频回旋加速器、等时性回旋加速器等。随着回旋加速器本身的发展,其应用日益广泛。近年来回旋加速器在核医学领域中的应用发展迅速,是一个引人注目的方向。用回旋加速器来生产核医学所需的短寿命、缺中子同位素;用作为快中子治癌的中子源和用作活化分析工具,是回旋加速器在核医学领域中应用的主要方面。

 
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