这些节点可以从地面的振动测量出车辆的速度和方向。
They were able to measure the speed and direction of vehicles from ground vibrations.
将车辆后侧举离地面，在后轮下安装拖曳支架。
Raise rear of vehicle off ground and install tow dollies under rear wheels.
将车辆后侧举离地面，在后轮下安装拖曳支架。
Raise rear of vehicle off ground and install tow dollies under rear wheels.
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