加速度指的是速度随时间的变化率。
By acceleration is meant the rate of change of velocity with time.
包含在给定区域的质量随时间的变化率。
The rate of change with respect to time of the mass contained within a given region.
实验结果表明： 盘缘区域温度随时间的变化率大于中心区域温度随时间的变化率；
The results show that the rate of temperature vs time at large radium is greater than that at small radius.
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