at once

1. 立刻；马上
2. 同时

同：	[r.] at a time, at one time, directly, forthwith

词义辨析

immediately，instantly，presently，directly，shortly，soon，at once，right away

这些副词或副词词组均有“立刻，马上”之意。
immediately指做完一件事后，立即就做另一件事，中间一般没有明显的时间间隔。
instantly指恰恰就在此刻，一秒钟也没耽误。
presently指不久、即将。
directly和immediately同义，指毫无迟疑。
shortly和soon同义，指动作发生或完成的速度之快。
soon常用词，指行动快，完成速度快。
at once口语中常用，语气强烈，指时间紧迫，一刻也不能耽误。
right away主要用于美国英语，语气稍弱于at once，强调动作迅速。

英英解释

副词解释：

without delay or hesitation; with no time intervening
- he answered immediately
- found an answer straightaway
- an official accused of dishonesty should be suspended forthwith
- Come here now!
[同] directly, forthwith, immediately, in real time, instantly, at once, like a shot, now, right away, straight off, straightaway
simultaneously
- he took three cookies at a time
[同] at a time, at once, at one time

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开心词场背单词

at once

副词解释：

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