the theory of natural selection, first propounded by Charles Darwin查尔斯∙达尔文首先提出的物竞天择理论Natural selection ensures only the fittest survive to pass their genes on to the next generation.自然选择确保只有最适应环境的物种得以存活下来，把基因传给下一代。All ba...
药效试验百菌清和波尔多液效果好,防效达90%以上,可作大面积防治选用药剂.Experiments showed Chlorothalonil and Bordeaux mixture were effective fortheir control.论述了在同一气相色谱条件下测定百菌清、腐霉利含量的方法.The analysis of chlorothalonil and procymidone by GC was introduced....
在纽伯里举行的伯克郡障碍赛中“水玉精灵”把骑师掀了下来。Crystal Spirit unseated his rider in the Berkshire Hurdle at Newbury.他送给我们一对玉狮子.He presented us with a couple of jade lions.深望玉成此事.It is earnestly hoped that you will accomplish the matter....
He cautioned us for playing in that busy street.他告诫我们不要在那条交通繁忙的路上玩.He cautioned that the Russia - American discussions were still in an exploratory stage.他警告说俄美会谈尚处于探索阶段.Citrus growers were cautioned to protect the fruit...