velocity profi1e

例句：

1. 1.The car accelerated to 60miles per hour.
   汽车以每小时60英里的速度加速。
2. 2. The project is moving ata steady pace.
   该项目正在稳步进行。
3. 3. Theship's speed was measured at25 knots.
   这艘船的速度被测量为每小时25节。