off the coast of western north america,however,sea otters fe

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off the coast of western north america,however,sea otters feed on the urchins and can prevent them from becoming too abundant,thereby keeping the kelp forests intact.4547 想知道prevent them from becoming 是个固定用法吗?

Off the coast of western North America,however,sea otters feed on the urchins and can prevent them from becoming too abundant,thereby keeping the kelp forests intact
一、结构分析
* 地点状语：Off the coast of western North America,在北美西部的海面上
* 插入语：however,但是,然而
* 句子主体：sea otters feed on the urchins and can prevent them from becoming too abundant,海獭以海胆为食,以免它们（海胆）变得太丰富,
* 状语：thereby keeping the kelp forests intact 从而保持海藻繁育地纯洁.
二、语言点
off the coast—— 在海面上
feed on——以…为食,以...为能源
prevent … from doing——使...不做某事,阻止...做某事
keep + 宾语 + 形容词补足语——使得…保持…状态
三、翻译：然而在北美西部的海面上,海獭以海胆为食,以免它们繁殖过多,从而保持海藻繁育地的纯洁.

In a dangerous part of the sea off the coast of New Zealand这 off the coast of mexicos off the southeast coast of mainland .is off the coast of Australia. off the coast located off the coast north of america还是north america. on the coast ,off the coast the ocean floor off the coast of Costa Rica.翻译 in the coast ,on the coast ,off the coast区别 It's off the east coast of Australia. 请翻译：a small island off the coast of Scotland