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。
If the source of ions is biased off ground, then the ion collector will most likely be at ground potential.
如果离子源偏离地电位，那么离子收集电极多半处在地电位。
If the source of ions is biased off ground, then the ion collector will most likely be at ground potential.
如果离子源偏离地电位，那么离子收集电极多半处在地电位。
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