if define ,end if用法问题！谢谢！
请问这段怎么翻译啊？？谢谢大家了！
#if defined(_WIN64)
# ifndef _WIN32
/*
a lot of code (mistakenly) uses #ifdef _WIN32 to either test for
Windows or to test for !__WIN16__, so we must define _WIN32 for
Win64 as well to ensure that the existing code continues to work.
*/
# define _WIN32
# endif /* !_WIN32 */

# ifndef __WIN64__
# define __WIN64__
# endif /* !__WIN64__ */
#endif /* _WIN64 */

[解决办法]
#if defined(_WIN64) //如果定义了_WIN64(如果是64位系统)
# ifndef _WIN32 //如果没有定义_WIN32
/*
a lot of code (mistakenly) uses #ifdef _WIN32 to either test for
Windows or to test for !__WIN16__, so we must define _WIN32 for
Win64 as well to ensure that the existing code continues to work.
*/
# define _WIN32 //那么定义_WIN32
# endif /* !_WIN32 */ //_WIN32的定义结束

# ifndef __WIN64__ //如果没有定义__WIN64__
# define __WIN64__ //那么定义__WIN64__
# endif /* !__WIN64__ */ //__WIN64__定义结束
#endif /* _WIN64 */ //_WIN64定义结束