“It is often dark by 4 pm.by 当什么讲?

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“It is often dark by 4 pm.by 当什么讲?

“It is often dark by 4 pm.by 当什么讲?
“It is often dark by 4 pm.by 当什么讲?

“It is often dark by 4 pm.by 当什么讲?
作为介词 .意思是不迟于 = not later than
例句:I shall be back by 5 o'clock.