它由许多字母组成，它们全然不同甚至毫不相似。

It consist of many letters, all of which look completely different and bear absolutely no resemblance to each other whatsoever.

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一旦条目到达一个非常细小的水平，就不要添加更多字母了。

Once items reach a trivial level then no more letters are added.

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字母表中的许多字母像b, c, d，等等都是辅音字母。

Many letters in the alphabet such as b, c, d, etc are consonants.

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