train velocity

• 车速

train velocity的用法和样例：

例句

1. There had been air raid warning, and the train slowed to thirty miles an hour.
   由于空袭警报已拉响，车速减到每小时三十英里。
2. When the engineer saw the red light he put on the brake suddenly to step down the train.
   火车司机看见红灯，猛地刹闸，渐渐减慢车速。