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这种长长的骨骼结构表明它是水生动物。
Painlevé 是水下拍摄的先驱，他拍了很多关于水生动物世界题材的短片。
Painlevé was a pioneer in underwater film-making, and a lot of his short films focused on the aquatic animal world.
为了消除这种杂草，生物学家建议用某种对人类和水生动物无毒的除草剂来处理受感染的部分湖泊。
In order to eliminate the weed, biologists proposed treating infested parts of the lake with a certain herbicide that is nontoxic for humans and aquatic animals.
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