main hygienic problem 主要卫生问题
The problem with non-hygienic macros is that the introduced variables can overwrite and be overwritten by other variables in the code.
非健康宏的问题是，引入的变量和代码中的其他变量可能相互覆盖。
These are what may be called the hygienic aspects of the problem.
这些都可以称之为卫生方面的问题。
This is an elegant solution to an elementary problem of heating hygienic drinking water without using copper brazing.
这是一个优雅的解决方案，不使用铜钎焊加热卫生饮用水的小学问题。
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