多孔壁的作用就象一把筛子。
The porous wall acts as a kind of seine for separating molecules.
多孔壁的作用就象一把筛子，它把不同质量的分子分开。
Thee porous wall acts as a kind of seine for separating molecules.
弹簧是“飞蝗腾达”弹跳跷的核心零件，它的作用就象人体的心脏，没有它就没有生命动力的来源。
Spring is the most crucial part of "Jumping stilts", it ACTS the function as the human body heart, there will be no driving force for life without it.
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