他不根据前提推理因而论证无效。

This non sequitur invalidates his argument.

youdao

他的推理是以人可以为善亦可以为恶为前提的。

His reasoning is based on the premise that all people are equally capable of good and evil.

《牛津词典》

首先，要有特定的前提,然后通过逻辑推理，一步步地，得出一个特定的结论。

We start with certain premises and by logical deduction, step after step after step, we come to a particular conclusion.

youdao

Toward the end of the discussion just now Victoria challenged the premise of this line of reasoning that's libertarian logic.

刚才，就在讨论即将结束之前,维多利亚质疑了,自由主义逻辑推理的前提。

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