The first principle for enlarging your vocabulary is to remember the meaning units that are used in naturally-occurring texts.

增加词汇量的第一个原则就是记忆那些真实使用中的意义单位。

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Morphology: it identifies the smallest meaning units (morpheme) in a language and looks into the ways the morphemes are arranged to form words.

形态学，涉及语言的内部组织，它研究意义的最小单位-语素合成词的过程。

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The key lies in the fact that the units of meaning, words, can be strung together in different ways, according to rules, to communicate different meanings.

关键在于表意的单位——词语可以按规则以不同的方式串连在一起，来传达不同的意思。

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The company says that the number of subscribers with integrated devices, meaning phone units with QUERTY or virtual keyboards, increased 42% from last year.

FORBES: AT&T's Record Sales Can't Ring Up A Gain

The rate of foreclosure in the Sunshine State was 3%, meaning one in every 32 housing units had received at least one foreclosure filing during the year.

FORBES: Worst Of Foreclosure Crisis Is Over But Problems Remain

Edwin Heathcote, author of the Meaning of Home, says that the volume housebuilders "try to squeeze in" as many units as they can into urban sites.

BBC: A life lived in tiny flats