他一躺下就睡着了
He fell asleep as soon as he lay down
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他一躺下就睡着了。
He fell as as he lay down.
youdao
他太累了，以至于一躺下就睡着了。
He was so tired that he fell asleep as soon as he lay down.
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