Taking time off helps you stay sharp.

留出一点时间能让你保持敏锐。

You exercise your body to stay strong, and you should exercise your mind to stay sharp .

你锻练你的身体以保持健康，所以你应该经常使用你的大脑以保持敏锐。

Older folks who are readers stay sharp while those who watch TV melt into the couch.

当那些躺在沙发上看电视的老人们给读者留下了鲜明的印象。

It is beneficial to Robbie because we can help him stay sharp. He is a professional and his behaviour on the pitch was fantastic.

这对罗比很有好处，因为我们能够帮他保持状态。他是个职业球员，他在场上的发挥总是非常的优秀。

The company claims the sapphire blades will stay sharp for about a year and offer complimentary cleaning and re-sharpening for an entire decade.

该公司声称蓝宝石的刀锋能保持锋利一年左右，之后将在十年内提供免费清洗与打磨。