"I wouldn't advise a parent to check every single assignment," says psychologist John Rosemond, author of Ending the Tough Homework.

“我不建议家长检查每一项作业。” 《终结艰难的家庭作业》一书的作者、心理学家约翰·罗斯蒙德说。

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Certain kinds of email are harder to deal with than others — the ones that require you to check your calendar or look up more information, type a lengthy explanation, or make a tough decision.

某些类型的电子邮件比其他的更难以处理——有些需要你查看你的日程表，有些需要查找更多的信息，或是回复一个详尽的解释，或是要做一个困难的决定。

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I found it tough to check out like that.

我发现自己很难做到这一点。

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South Africa has passed tough legislation that includes a requirement for a thorough background check for prospective gun owners.

CNN: February 17, 2013 -- Updated 0449 GMT (1249 HKT)

Check out these and other incentive prizes and challenges and get involved in solving tough problems at Challenge.gov.

WHITEHOUSE: Challenge.gov: Two Years and 200 Prizes Later