initial speed的用法和樣例：
例句
- Reference values of the serv ing angles of the racket with different speed and height were provided.
給出以不同初速度和高度發(fā)球時(shí)球拍角度的參考值。 - The body appears to remain suspended in space if it has no initial velocity relative to the elevator.
如果物體相對于升降機沒(méi)有初速度的話(huà)，這個(gè)物體看起來(lái)就好象是一直懸在空中不動(dòng)。
