y consuming large numbers of sea urchins,sea otters act as a keystone species structuring the kelp forest community
【由于食用大量的海胆类生物,海獭构成了藻丛群落中的一类关键物种.】
by consuming large numbers of sea urchins,sea otters act as
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this ecological balance among sea urchins,sea otters ,and ke
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However,unlike the cases of sea otters and pinnipeds (seals,
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by sea和by the sea
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辨析by the sea / at the sea
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