Polar bears usually subsist on seals, which they hunt from a platform of sea ice.
北极熊通常在浮冰上抓捕海豹作为食物.
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The animal seizes its prey by the throat and suffocates it to death.
这种动物会抓住猎物的喉咙,使其窒息而死。
朗文当代高级英语词典 第6版
However, once enter practice, such and such problem block up is worn catch fulfil.
然而, 一旦进入实践, 就有这样那样的问题阻碍着抓落实.
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