首先，一个编译单元（translation unit）是指一个.cpp文件以及它所#include的所有.h文件，.h文件里的代码将会被扩展到包含它的.cpp文件里，然后编译器编译该.cpp文件为一个.obj文件-First of all, a compiler module (translation unit) is an. Cpp file and# include it all. H files,. H file of the code will be extended to include it. Cpp file, and then the compiler to compile . cpp file as a. obj file