Volvo has introduced a system called "City Safety" that reduces the chance of low-speed crashes in which the driver fails to brake in time, usually causing a rear-end collision.
沃尔沃（Volvo）也引入了一个名叫“城市安全”的系统，它可以降低因驾驶员未能及时刹车而导致低速撞车的可能性（往往是追尾）。
This is normally done by charging the brake pipe fully from one end of the train and checking that it has charged at the other end.
通常的做法是从列车制动管的一端充气，观察另一端的变化。
The drive system includes motor, transmission, brake, transmission, etc... One end of the main shaft is provided with an Angle plate, which is used to indicate the unbalanced phase of the workpiece.
驱动系统包括电机、传动装置、制动装置、传动方式等。主轴的一端安装角度盘，用来指示工件不平衡相位。
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