Well, how pleased I am! and it is such a good joke, too, that you should have gone this morning, and never said a word about it till now.
你这个玩笑开得真太有意思,谁想到你竟会今天上午去拜访他,而且到现在一字不提。
It might be very useful. But now it is gone.
——或许很有用吧,但是现在文件已经没有了。
It might have happened when you were a child and now it [the infectious agent] is long gone, but it sets you up for a problem later in life.
你也许在小时候受过一次感染,而现在它(那个感染源)已经不复存在,但它为你后来的某个疾病埋下了病根。
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