Increasingly, objects are "dynamic" in the sense that their structure and behavior is not captured by a static type, or at least not one that the compiler knows about when compiling your program.
对象的意义变得越来越“动态”，它们的结构和行为无法通过静态类型来捕获，或者至少编译器在编译程序时无法得知对象的结构和行为。
Yes. It triggers "undefined behavior"; the compiler is entitled to crash your program the moment you do it, or worse.
是的。它触发“未定义行为”，编译器是有权使程序崩溃的时刻你做，或者更糟。
Allows you to set compilation properties defining compiler behavior, such as compiler warnings, optimizations, and compilation constants.
可用来设定定义编译器行为的编译属性，例如编译器警告、最佳化和编译常数。
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