虽然这仅比对系统头文件使用 grep 方便一小点，但是它更不容易出错。

This is just a tad more convenient than using grep on system header files, but it's less error-prone.

youdao

系统头文件可能以文件方式保存，也可能以系统特有的其他格式保存。

System headers may be stored as files or in some other system-specific format.

youdao

您的系统头文件和手册页也是有关您的系统可能支持的非标准值的信息的最好来源。

Your system headers and manual pages are also your only source of information about the non-standard values that your system might support.

youdao