An unsigned integer and the result of the sizeof operator.
这是一个无符号整型，是执行size of操作的结果。
The sizeof operator cannot return the size of dynamically allocated arrays or external arrays.
不会返回动态分配数组或扩展数组的大小。
The marshaled layout could be different from the internal layout, so it's possible (and, in fact, probable) that the types I've described will report different results when using the sizeof operator.
封送处理的布局可能不同于内部布局，因此在使用size of运算符时，我已经描述的类型可能(实际上是非常可能)报告不同的结果。
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