[练习题]Complete the following statements with proper words or expressions according to the course book.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
Vocabulary is the most unstable element of a language as it is undergoing constant changes both in form and content. 词汇是语言中最不稳定的一种要素，因为它在形式和内容上都在不断变化。
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