In this question, " is" has a special status called an operator.

在这个疑问句中，“is”有一个特殊的地位，被称作“连接运算符”。

The reason for this is that the classical grid-based simulators utilize a technique that mathematicians like to call operator splitting.

这是由于经典的基于网格的模拟器利用了一种数学家喜欢称之为算子分裂的技术。

Sometimes in this context, you'll hear these called operators instead of transformations, but the meaning is the same.

有时在这种情况下 您会听到这些被称为操作符而不是转换 但含义是相同的。