老爷子的话有些道理。不过现在<<普通XX学>>用多了，汉语“普通”原来没有这个意思，也算增加了一个语意了。语言有时就是这样，即使错用了，但大家接受了，就可以。

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General:

–adjective 1. of or pertaining to all persons or things belonging to a group or category: a general meeting of the employees.
2. of, pertaining to, or true of such persons or things in the main, with possible exceptions; common to most; prevalent; usual: the general mood of the people.
3. not limited to one class, field, product, service, etc.; miscellaneous: the general public; general science.
4. considering or dealing with overall characteristics, universal aspects, or important elements, esp. without considering all details or specific aspects: general instructions; a general description; a general resemblance one to another.
5. not specific or definite: I could give them only a general idea of what was going on.
6. (of anesthesia or an anesthetic) causing loss of consciousness and abolishing sensitivity to pain throughout the body.
7. having extended command or superior or chief rank: the secretary general of the United Nations; the attorney general.