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来源：学生作业帮助网编辑：作业帮时间：2024/05/09 05:33:15

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at once[英][æt wʌns][美][æt wʌns]adv.立即; 一起; 同时; 立刻;

immediately，马上，立刻。

立刻 immediately ，right now

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