最后他得出结论，有些动物每天只需要数小时就可以获得生存和繁衍所需的能量，而有些则需要一整天都在摄取食物。
“These conclusions explain why some animals can survive and reproduce optimally with only a few waking hours, whereas others need to eat all day and must have reduced sleep time, ” he told Nature.
还有些人坚持认为头发要每天花数小时拉直才会好看。即使你有时间，你自己能做到吗？
Others will insist that your hair will look better with hours of straightening every day... yet even if you had the time, would you use it for doing that?
有些瑕疵但还是很有趣：在多人模式下，实况足球2010可以带来数小时的乐趣。
Flawed but fun: pro Evolution Soccer 2010 provides hours of entertainment in its multiplayer mode.
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