The porousness of snow makes it absorb sound.
雪花的使它声音。
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These are porous molecular networks through which air can circulate. Their porosity gives them a huge surface area.
这些是分子网络,空气可以通过它们循环。它们性使它们有很大表面积。
The shell helped protect the embryo from diseases and attacks, but it was also porous enough to let gases reach the embryo so it could breathe and grow.
外壳有助于保护胚胎免和攻击,但它性也足以让气体到达胚胎, 使其能够呼吸和生长。
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