He closed the book, yawned, and went to bed.
他合起书, 打了个呵
, 
上床睡
了。
He closed the book, yawned, and went to bed.
他合起书, 打了个呵, 上床睡了。
I’m afraid geophysics is rather a closed book to me.
我对
理学一窍不通。
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