1
for a while
Please sit down and rest for a while.
请坐下休息一会儿。
一会儿；片刻
先理解核心含义，再看它在真实句子里的用法。
一会儿；片刻
a period of time, especially a short one
Please sit down and rest for a while.
请坐下休息一会儿。
Please wait here for a while.
请在这里等一会儿。
I haven't seen him for a while.
我有一阵子没见到他了。
Let's sit down and rest for a while.
我们坐下来休息一会儿吧。
Please sit down and rest for a while.
请坐下休息一会儿。
After a while, the rain stopped.
过了一会儿，雨停了。
I saw him a while ago.
我刚才看见他了。
I'll be back in a while.
我一会儿就回来。
Not this
I have been waiting here a while.
Use this
I have been waiting here for a while.
在表示持续一段时间时，'a while' 作为名词短语，需要介词 'for' 引导时间状语，否则句子结构不完整。
Not this
I will be back a while.
Use this
I will be back in a while.
'a while' 不能直接作时间状语表示'过一会儿'，必须用介词 'in' 或 'after' 构成介词短语。
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Dictionary facts from ECDICT.