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jump in
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1.PHRASAL VERB 短语动词 匆忙行动；不假思索地做 If you jump in, you act quickly, often without thinking much about what you are doing.
【语法信息】：V P
The Government had to jump in and purchase millions of dollars worth of supplies.政府不得不匆忙购进价值数百万美元的补给品。
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