What is love? The old question has been puzzling human being for centuries.

什么是爱情，这一古老的问题困扰人类已有数千年。

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The duality of money has been puzzling people since its first appearance.

金钱的双重性自出现以来就一直困扰着人们。

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The failure of semiconductor due to high power microwave has been puzzling people for a long time.

在高功率微波作用下，半导体器件的失效问题一直困扰着人们。

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Mathematicians have solved a number mystery that has been puzzling them for hundreds of years.

BBC: The secret of squares revealed

This modest paradox has been puzzling me since Mr Miliband's speech to his party conference.

BBC: Has Miliband got his nations in a twist?

This case has been puzzling from the start.

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