但却缺乏一定的现实意义。的翻译：But lack a certain degree of practical significance. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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But lack a certain degree of practical significance.

But lacks certain practical significance actually.

But a certain lack of practical significance.

But lack a certain degree of practical significance.