求翻译：任何一种语言的词汇系统都会既历经时代变化而变化，又在时代中努力保持着本系统的稳定，它处在永恒的变化之中，不变只是暂时的、相对的。因此，历时变化是词汇发展的一个基本特征。是什么意思？

The vocabulary of any language system will not only after the times change, but also in the era of efforts to maintain the stability of the system, it is in perpetual change, change is only temporary and relative. Therefore, the last change is an essential feature of vocabulary development.

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Any words of a language system will both have gone through the changes of the times change, and efforts to maintain the stability of the system in the era, it is in a permanent change, no change is only temporary, relatively. Therefore, during the change of vocabulary development is an essential fea

The vocabulary of any language system will not only after the times change, but also in the era of efforts to maintain the stability of the system, it is in perpetual change, change is only temporary and relative. Therefore, the last change is an essential feature of vocabulary development.