循环论证常常导致无休止的辩论而没有解决。

A ___circular argument often leads to endless debates without resolution.

她的解释是循环的，只是重复问题而不是回答它。

Her explanation was ___circular, merely restating the question instead of answering it.

为了避免循环讨论，我们需要引入新的证据。

To avoid a ___circular discussion, we need to introduce new evidence.