It seems a strange question, and yet it is one that has puzzled some people for a long time.
这个问题似乎很奇怪，但却长时间困扰着一些人。
The question that puzzled them is how it is that they can get rid of the air pollution in the area.
让他们感到困惑的是他们怎样才能消除这个地区的空气污染。
"Why is it," Jonathan puzzled, "that the hardest thing in the world is to convince a bird that he is free, and that he can prove it for himself if he'd just spend a little time practicing?"
“怎么搞的，”乔纳森觉得纳闷，“世界上最难办的事怎么倒是使一只鸟儿确信他自己是自由的，而且可以亲自加以证明，只要他肯略微花费点时间练习练习？”
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