But what you don't need is that uncomfortable feeling that your work area is about to change underneath your feet in some unpredictable way.
但是你不需要的是你的工作领域在你的脚下以一种不可预知的方式被改变，这种是一种令人不舒服的感觉。
2
With several feet of car body in front of the driver, the energy of a crash can be dissipated and the suddenness of the change in velocity can be reduced, they say.