这类似于适用于integer、decimal、float、double或其混合类型的加法运算符(“+”)，也类似于面向对象中的多态性。
This is similar to having plus operators (" + ") that apply to integers, decimals, floats, doubles, or a mix of these types. This is also similar to the polymorphism found in object orientation.
乘法和加法是混合性运算。
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