rate of change in的用法和樣例：
例句
- She is strict in the matter of discipline.
她對紀律的要求是嚴格的。 - Lack of education was a liability in getting a job.
缺少教育對找工作不利。 - The figures in brackets are annual growth rates.
括弧內的數字是按年變化率。 - The rate of change of momentum of a body is proportional to the impressed force and takes place in the direction of that force.
一物體動量的變化率與外加力成正比，並與外加力的方向一致。
