He argues with learning and logic.他的辩论既有学问又合逻辑。
I didn't follow her logic.我不理解她的逻辑。
At this point our logic was at fault.在这一点上,我们推理的方法是错误的。
There's no logic in spending money on useless things.把钱花在没用的东西上根本不合理。

［同义词］   good sense, science of reasoning
［词源］＜希腊语logike(推理艺术)