And they are in motion and moving at very, very high speed.

它们都在运动,以非常非常高的速度运动。

麻省理工公开课 - 固态化学导论课程节选

fast train, high speed train.

它是快速火车，高速火车。

介绍欧洲之星 - SpeakingMax英语口语达人

You shoot something, you should know when it will land, where it will land, with what speed it will land, how high it will go.

抛出一个物体,我们要知道落地时间,落地位置,还有落地的速度,最高点的高度

耶鲁公开课 - 基础物理课程节选