Sorry, I don't quite understand some difficult points in this unit.
抱歉，我不太明白这个单元的一些难点。
Learners hold the knowledge points as the unit to learn knowledge.
学习者是以知识点为单位来学习知识的。
The number of data points or measurements per unit of time or distance.
单位时间或单位距离内测量点或数据点的个数。
The number of data points or measurements per unit of time or distance.
单位时间或单位距离内测量点或数据点的个数。
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