( )is the most unstable element of a language as it is
undergoing constant changes both in form and content.
【正确答案】:VOCABULARY
【题目解析】:词的形式和内容总是处于变化之中,是语言中最不稳定的因素。不过相比之下,词的内容比形式更不稳定。
( )is the most unstable element of a language as it is undergoin
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