In recap, most OOP programming is single dispatch; that is, just one designated object determines which code path is taken.
现在我们回忆一下，大部分OOP编程都是单一的分派；这就是说，只有一个指定的对象用来确定要走哪条代码路径。
In single-dispatch polymorphism, the object that "owns" a method is singled out.
在单分派多态性中，挑选出“拥有”方法的对象。
In single-dispatch polymorphism, the object that "owns" a method is singled out.
在单分派多态性中，挑选出“拥有”方法的对象。
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