[数] 部分和；部分和数

partial sums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。

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