单词：tractive force
tractive force的用法和样例：
例句
- The real time calculation of tractive force and braking force is the core of the system.它的核心是能够实时计算得到机车运行过程中的牵引力和制动力。
- If the pulling force is equal to the friction, the car will continue forward at the same speed.如果牵引力等于摩擦力，车子将匀速前进。
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