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21. 在逻辑学中，‘元’这一层级专门用于对系统本身进行描述。

    zài luó​ji​xué zhōng,‘yuán’ zhè yī céng​jí zhuān​mén yòng​yú duì xì​tǒng běn​shēn jìn​xíng miáo​shù.

    In logic, the 'meta' level is specifically used to describe the system itself.

    Source: Dong Chinese Dictionary