Hard work and serious problem solving requires downtime, so hit the sheets early to ensure your brain will be ready to recall and memorize.

处理大量而困难的工作也需求休整工夫，所以早点休息以确保你的大脑能预备好恢复和更好地记忆。

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Hard work and serious problem solving requires downtime, so hit the sheets early to ensure your brain will be ready to recall and memorize.

解决大量而困难的工作也需要休整时间，所以早点休息以确保你的大脑能准备好恢复和更好地记忆。

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When influenza hit early and hard in the United States this year, it quietly claimed an unacknowledged victim: one of the cutting-edge techniques being used to monitor the outbreak.

今年流感在美国的暴发比往年要早，在肆虐的流感面前，一项用来监测流感暴发的尖端技术也暴露出了自身的缺陷。

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Hit it early and hit it hard.

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Especially hard hit were long-service early retirees that retired between 2000 and 2005.

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There has been a dramatic fall in the numbers of boarders from military families, and the recession of the early 1990s hit a lot of schools hard.

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