partial sum

• 部分和

partial sum的用法和样例：

例句

1. 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。
2. 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。
3. 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。