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...
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...
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....
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....