道理 (dào lǐ) — reason, argument (the logic or principle that supports a claim); sense, the way things should be (as in 讲道理)

Definition

Examples

• 你讲的很有道理。
  Nǐ jiǎng de hěn yǒu dào lǐ.
  What you said makes a lot of sense.
• 这个道理很简单，你一定能明白。
  Zhè ge dào lǐ hěn jiǎn dān, nǐ yí dìng néng míng bai.
  This principle is very simple; you'll definitely understand it.
• 做事不能不讲道理。
  Zuò shì bù néng bù jiǎng dào lǐ.
  One cannot be unreasonable in doing things.