And it's at the height of this vision of our floral decoration of Lycidas' hearse that the speaker is suddenly caught up short.

都到了用鲜花装饰利西达斯的灵车,的时候了读者才突然领会到。

耶鲁公开课 - 弥尔顿课程节选

It knows that this particle happened to have a height of 15, at the time of 0, and a velocity of 10, and it is falling under gravity with an acceleration of -10.

这个质点恰好处在高度为15的地方,零时刻,初速为10,并在重力作用下以-10的加速度下坠

耶鲁公开课 - 基础物理课程节选