形态学是语法学的一个分支，它研究的是单词的内在结构及单词的构成规律。

Morphology is a branch of grammar which studies the internal structure of words and the rules by which words are formed.

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这样就使得构成长单词的细胞非常有可能再次被选中。

This makes cells that make up long words very likely to be chosen again.

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我是一个由七个字母构成的单词。

I am a seven letter word.

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