关于periods of 和 a period of的英语问题

关于periods of 和 a period of的英语问题
periods of 和 a period of的意思是什么?
例如periods of time he a period of time

ericlam 1年前已收到2个回答举报

共回答了13个问题采纳率：92.3% 举报

periods of time 表示多个时间段,
We meet different problems at periods of time in life.
在我们人生的不同阶段我们遇到的状况不同.
a period of time 表示一个时间段.
They had the conference for a period of time.
他们开会花了一段时间.

1年前

zosAuXg1 幼苗

共回答了6个问题举报

一段时间，他在一段时间内

1年前

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