单词：partial sum
partial sum的用法和样例：
例句
- The infinite series diverges, meaning that its sequence of partial sums does not tend towards any finite limit.Equivalently, one says that lacks a sum.此无穷级数发散，即其部分和的序列不会趋近于任一有穷极限，可等价地认为不存在和。
- Up to a certain sum of the interior angles on one side of the transversal the two lines might indeed meet.截线一侧两内角到达一定的和数，两直线可能一定相交。
- The greater the sum, the greater the cross-correlation coefficient obtained in this way will be.和数越大，以这种形式得到的相关系数也越大。
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