closing speed

基本解释

Speed Control Valves are available for controlling valve opening or closing speed with pneumatic actuators.
速度控制阀可以用来控制阀门气动执行器的开启或关闭速度。
Industrial Swing Check models can be fitted with an optional counter balance device to further control closing speed.
工业旋启式止回阀系列可以配置反平衡装置来进一步控制关闭速度。
The higher the closing speed of two aircraft heading towards each other, the bigger the PAZ required, because the pilot needs more time to react to a warning.
两架相向飞行的飞机速度越高，所要求的“保护空域”越大，因为飞行员需要更多的时间对预警做出反应。

Now, at the closing speed, the headlights on, I would've had a hard time telling the color of the vehicle, let alone the driver.
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