A priori, a fortiori, a posteriori. 先说a priori。这个词有个正 | Desvl English Tips

A priori, a fortiori, a posteriori.
先说a priori。这个词有个正式的翻译是”先验“，指的是已经事先知道的、独立于经验的知识。A priori翻译成英文的意思是"from the earlier"，在句子中可以理解成as/that we have already known.
e.g. This algorithm requires not much a priori knowledge of the system parameters.
A fortiori的意思是"from the stronger"。这里的区别就在于earlier和stronger。Earlier在这里强调了”之前的“，stronger在这里强调”更强的“。如果一个人死了，那么这个人自然不会呼吸了。死亡自然是比不能呼吸更”强“的。所以a fortiori也可以理解成 the weaker conclusion.
e.g. That is the case even when charges against the person are being contemplated; a fortiori, there is no excuse for gratuitously embarrassing someone who is suspected of no wrongdoing.
最后的a posteriori就是”后验“，翻译成英文是from the later. 强调的是通过经验、观察等推导出来的。
e.g. This a posteriori saga gives us a refreshed Raphael, whose psychological acuity feels newly approachable.