真抱歉！我心不在焉的。
I made a huge mistake in my job since I was absent-minded.
因为我今天精神不好的关系，我在工作的时候就犯了个巨大的错。
We had half-an-hour for writing our copybooks; that was a time when, pen in hand, I used to become absent-minded and my thoughts wandered hither and thither.
我们有半小时的时间摹写字帖；这段时间我常心不在焉，手里拿着笔，思想却在到处漫游。
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