1 sentence

1. 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