这个跟传统背包不同—它防水。

The traditional backpack with a difference—it's waterproof.

《牛津词典》

出于这个原因，就没有什么比睫毛膏更需要防水的了。

For this very reason, nothing more than mascara has to be definitely waterproof.

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桦树有白色的树皮，树上这个坚硬的保护外层，这个白色的树皮，是防水的。

The birch tree has white bark, and this tough protective outer layer of the tree, this white bark, is waterproof.

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