It could have been just another man doing a good deed.

他可能只是一个正在做好事的人。

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Should one expect a reward when doing a good deed?

就是说我们应该在做了一件好事之后，希望得到一个回报吗？

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Of course, while doing a good deed we should also use our head.

当然，在做好事的时候我们要用用脑。

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Take the case of David, a financial professional from New York who's doing a good deed and had no idea he was opening himself up to swindlers.

NPR: Identification Theft: Protecting Your Personal Data

"We're doing a good deed for our customers, " he says.

FORBES: Good Will Hunting

Twitter has in many ways done Guy Adams a huge favor, but it is is the kind of good deed it should try to avoid doing in future.

FORBES: Bill Keller, Guy Adams And The Twitting Of Twitter