Bean cake was the best nitrogen source, and their optimal mass concentration for Bacillus sp. X18 and X10-1-2 were 4 % and 1 %, respectively.

两株菌的最佳氮源均为豆饼，X18的最佳豆饼质量分数为4%，而X10 - 1 - 2的最佳豆饼质量分数为1%。

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Are we to give cake and sugar to a minority when the mass of workers and peasants still lack black bread?

当工人和农民大众缺乏黑面包时，我们又会否为少数人提供蛋糕和糖呢？

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What do a landing plane, a baking cake, a cooling tower and sweetened tea have in common? They all involve a transfer of momentum, heat or mass.

一架着陆的飞机、一个正在烘烤之中的糕点、一座冷却塔和一杯加糖的茶，它们都有什么共同点？它们全都包含有动量、热量和质量传递。

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