Objective-C语言通过运行时系统实现动态特性，无需仅依赖编译器执行代码，运行时系统作为其操作系统的角色，确保语言功能的实现。
The Objective-C language defers as many decisions as it can from compile time and link time to runtime. Whenever possible, it does things dynamically.
This means that the language requires not just a compiler, but also a runtime system to execute the compiled code.
The runtime system acts
as a kind of operating system for the Objective-C language; it’s what makes the language work.
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