Vocabulary is the most unstable element of a language as it is undergoing constant changes both in form and________ .
【正确答案】:content
【题目解析】:根据课本第134页理解,词汇是非常容易变化,它的形式和内容都在不断变化,因此答案是content。
Vocabulary is the most unstable element of a language as it is u
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