在汽车中，乘员都是坐在预先设定的位置，这样一旦传感器检测到了撞击，气囊就会在最适当的时候打开。

In a car, where the occupants are sitting in known positions, the airbags can be deployed at the optimum time after sensors detect an impact.

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首先，研究小组在受控环境中看着啄木鸟：两个慢动作摄像机捕获它们撞击力传感器的图像，后者是用于测量其啄力的。

First, the team had a look at woodpeckers in a controlled environment: two slow-motion cameras captured images of the birds striking a force sensor that measured their pecking power.

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