If you're being called names or teased, imagine that you're inside a huge fish tank filled with white fog.
如果你被辱骂或嘲笑,想象你在一个雾气朦胧的大鱼缸里。
There we learn that a walrus was called a walrus by 1655 but that as an animal it had been known long before and appeared with other names in the writings of Alfred the Great back around 893.
就此我们可以知道,海象直到1655年才被称为walrus,但这种动物早已被人熟知,它在893年阿尔弗雷德大帝的作品中就以其他名字出现过。
The idea of replacing introduced variable names with non-conflicting names is called hygiene; the resulting macros are called hygienic macros.
用不冲突的名称替换引入的变量名,这种方法称为健康的(hygiene);产生的宏称为健康的宏(hygienic macros)。
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