velocity head graph

例句：

1. 1.The car accelerated to 60 miles per hour.
   汽车以每小时60英里的速度加速。
2. 2. The project is moving at a steady pace.
   这个项目正在稳步进行。
3. 3.The boat sailed at a leisurely pace along the river.
   船在河上悠闲地航行。