In ancient China, hand fans were almost the only ones to help people keep cool.

在古代中国，手扇几乎是唯一的帮助人们保持凉爽的工具。

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On average,students using swear words were able to keep their hand in the water for about two minutes.

VOA: special.2009.08.18

On the other hand, temperature, volume and pressure are variables that are much easier in the lab to keep constant.

另一方面，温度，体积和压强,在实验室中比较容易保持恒定。

麻省理工公开课 - 热力学与动力学课程节选

With Leinster playing against a stiff breeze in the first half the hosts were always going to keep the ball in hand where possible.

BBC: Leinster 22-9 Leicester

Always keep your belongings in hand, and try not to wear flashy clothing or jewellery that might make you stand out as a target.

BBC: Central America��s shift in safety

Although angel networks are investing in startups at later stages, it is very likely that they, VCs and other large investors will want to keep a hand in the early startup arena.

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