双音词就是在原来单音词的前面或后面加一个同义词或近义词，合成一个双音词（原来的词作为语素之一）。一般来说，古代单音词居多，一个字就相当于一个词，现代双音词居多，这是古今汉语在词汇方面一个显著的不同。
The amount of double-syllable words in annotation to erya by Guopu is large and the form of word-building have matured basically.
郭注双音词不仅数量丰富,而且构词形式也已基本成熟。
参考来源 - 郭璞《尔雅注》双音词研究The morphemes of synonymous coordinate disyllables have their own developing process as the independent monosyllabic lexical words or morphemes. Their semantic meaning differs in direction,extent and extension.
古汉语同义并列双音词的构词语素作为独立的单音词或语素在各自的发展过程中,其语义的发展方向、范围和程度都呈现出一定的差异,它们所在的同义义场也处于不断的发展演变中。
参考来源 - 从《说文解字》的同义词看同义并列双音词词素义的历时演变With Rulin Waishi as the original text, the dissertation attempts to make a systematical study on the composition and features of double-syllable words.
本文以《儒林外史》为蓝本，试对其中的双音词构成状况及特点进行系统地分析和研究。
参考来源 - 《儒林外史》双音词研究·2,447,543篇论文数据，部分数据来源于NoteExpress
汉语双音词是第二语言学习者的难点，也是教师们极为关注的教学重点。
It's difficult for second language learners to master Chinese dissyllabic compounds, which is also a focus teachers are concerned about.
这一时期的词语变化的特点主要有二个：一是所产生的新词主要是双音词；
The characters of the change of words and expression in this period include two points. One is the new words are mainly double-syllable words.
简缩式双音词的流行使用表明“双字格”凭着极强的新词生成能力已成为汉语构词范式。
The popular use of the shortened disyllabic words indicates that the double character form has become the paradigm of Chinese word - formation due to its very strong ability of word generation.
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