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