同轴、管内螺纹弹簧单导对夹式止回阀，专门用于防止水击作用和倒流现象。

The ALC? is an in-line, spring assisted, single guided "wafer" check valve designed to prevent "water hammer" and "reverse" flow.

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应用弹性动力学分析方法，在合理假设的基础上，建立了震击作用动力学模型。

A dynamic model for jarring action is set up based on a rational assumption and by using the elastic dynamic analysis method.

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你可以通过使用适当的手势来强调你要说的话，一只摇动的拳头、一只或两只手、一个切下去的手势都有助于强调信息，还有一种将拳头击手掌的手势也可起到相同作用。

A shaking fist or a slicing gesture with one or both hands help emphasize a message. So does pounding your fist /into/ the palm of your hand.

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