他们研究了咖啡因对两组男性锻炼者的作用：一组是通常很少饮用咖啡的，另一组则是保持着平均每天四杯咖啡的吸收量。

They studied the effects of caffeine on two groups of male exercisers: those who usually consumed little caffeine and those with an average intake of four cups a day.

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控制光合作用的叶绿素呈现绿色也是有原因的——它反射了绿光，与太阳的光谱保持一致，这样它才能最有效地吸收阳光。

It is tuned to the spectrum of the sun in order to absorbsunlight in the most efficient way possible. The reflected green is the lightit rejects.

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树木所起的作用不止于保持水土。树木还吸收水份、防止洪水突发，并使河流不至于含有可杀死鱼类的泥沙沉淀。

Trees do more than keep the soil in place. They also soak up water and prevent flash floods, and keep rivers clear of sediment that can kill fish.

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