这本书涵盖拐点(各种形式的话)，以及构词法，如何在新词可加入到词汇的语言。
This book covers both inflection (the different forms of a word), and word formation, the ways in which new words can be added to the vocabulary of a language.
英语词汇增加的历史特点是大量地借用外来词和通过构词法构成新词。
The history of English lexical expansion is one that is characterized with heavy borrowing and word formation.
派生法在构词法中最有生气， 它是通过在词根前后添加前缀和后缀而构成更多新词。
Derivation in word formation of the most dynamic, it is through the root before and after adding prefixes and suffixes and form more new words.
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