the process of making judgments about something based on sensible thinking or logic (= a formal scientific method of thinking about ideas)

Aquinas takes a rather dim view of discursive reason or ratiocination as compared to sheer understanding. 与纯粹的理解相比，阿奎那对话语论证或推理的看法相当模糊。

The detective in the story is known for his gifts of observation and ratiocination. 故事中的侦探以其观察力和推理能力而闻名。