Selection is a pretty simple concept, but there are a couple of basic variants worth discussing.
选择是相当简单的一个概念，但有一些变体值得我们来讨论。
The concept behind duck typing, also known as late binding, is pretty simple; if an object responds to all the methods a function is expected to call, that object can be passed to the function.
Ducktyping背后的概念非常简单，就是所谓的迟绑定；如果对象具有某个函数希望调用的所有方法，就可以将这个对象传递给该函数。
The concept behind duck typing, also known as late binding, is pretty simple; if an object responds to all the methods a function is expected to call, that object can be passed to the function.
Ducktyping背后的概念非常简单，就是所谓的迟绑定；如果对象具有某个函数希望调用的所有方法，就可以将这个对象传递给该函数。
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