velocity descontinuity

例句：

1. 1. The car accelerated to 60 miles per hour on the highway.
   汽车在高速公路上以每小时60英里的速度加速。
2. 2. The project will take three months to complete.
   这个项目需要三个月才能完成。
3. 3.The train's velocity is increasing as it approaches the station.
   火车接近车站时速度正在增加。