变量可以是前述每种转换类型的源和目标。

A variable can be a source and a target for each of the transform types described earlier.

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在构建一个处理流时，也会遇到处理流中的某个变量需要转换类型的情况。

When building a process flow, there are also cases where a variable in the process flow needs to be converted from one type to another.

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把包含原子值(数字、布尔值或字符串)的变量和另一个此类变量或者文字原子值比较，希望一种类型自动转换成另一种类型。

Comparing a variable having an atomic value (number, Boolean, or string) to another such variable or a literal atomic value, and expecting the type of one to be cast automatically to the other type.

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