parallel summation

• 并联求和

parallel summation的用法和样例：

例句

1. The standard summation function is applied.
   应用标准的求和函数。
2. His notation is different from modern notation but can be constructed using more modern summation notation.
   他的符号是不同的，从现代符号，但可以采用更现代的求和符号。