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单词 salt particle
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A membrane with pores bigger than water particles, but smaller than salt particles, only lets fresh water pass through, transforming what was once undrinkable into a life saver.

一种孔隙大于水颗粒但小于盐颗粒的膜,只允许淡水通过,将曾经不可饮用的东西变成救生员。

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