velocity
🇺🇸
/vəˈlɑːsəti/
🇬🇧
/vəˈlɒsəti/
how fast something moves in a certain direction
The ball's velocity increased as it rolled downhill.
球的速度随着它滚下山坡而增加。
very fast speed
The car reached an incredible velocity on the straight road.
汽车在直道上达到了惊人的速度。