总经理知道那两个人是通过后门进来的，但是他不清晰到底谁是他们的后台。
The manager knew that the two new employees came in by the back door, but he didn't know exactly who were at the back.
总经理知道那两个人是通过后门进来的，但是他不清晰到底谁是他们的后台。
The manager knew that the two new employees came in by the back door, but he didn't know exactly who were at the back.
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