I'll first look at invoking a method with delayed binding, and then I'll show techniques you can use to change the definition of a class at run time.

首先介绍延迟绑定调用方法，然后介绍一些可以在运行时改变类定义的可用技术。

youdao

As frequent flyers know, the payoff for dealing with airport security (even then) and regularly delayed flights was and is the possibility of an upgrade to first class with seats that are actually meant to house a human body of normal size.

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