作业前的准备：作业前要观察场地是否符合要求。停车后要拉上驻车制动器。

Preparation before working: observe whether the area is accord with requirements before working. Pull on parking brake after parking.

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车子很快接近了一台开得很慢的面包车，我精神紧张起来，把脚放在刹车踏板上准备随时制动。

We were approaching a slow-moving minivan quickly and I tensed, my foot hovering over the brake pedal.

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针对制动之前较长时间的准备运行带来较大测量积累误差的缺点，采用向后数值积分的算法。

To solve the problem of growth in the error of long time of preparative running before braking, a backward algorithm is presented.

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