understand

Compared meaning: learn that something is true indirectly (verb).

比较义项：从间接来源得知某事属实（听说/推断）（动词）。

• understand 本词

  Understand here means you were told or have heard the information from someone else; it reports secondhand knowledge, not something you worked out yourself.

  这里的understand表示你是从别人那里听说或得知这个信息，是转述别人告诉你的内容，而不是自己通过推理得出的。

  I understand that the flight has been delayed until tomorrow morning.

  我听说航班延误到明天早上了。

• infer

  Infer means you reasoned this out yourself from clues or evidence, rather than being told directly; it often follows 'from' plus the evidence.

  infer表示你根据线索或证据自己推理得出结论，而不是被直接告知；常与「from + 证据」这样的结构搭配使用。

  From her tired voice, we could infer that she hadn't slept well.

  从她疲惫的声音，我们可以推断出她没有睡好。

Understand and infer both mean to learn something is true, not by seeing it directly. Understand means someone told you; it reports secondhand information. Infer means you worked it out yourself from clues, often followed by 'from'. Understand's common meaning 'comprehend' is not compared here.

这两个词都表示间接获知某事为真，但来源不同：understand强调是听别人说的，属于转述；infer强调是自己根据线索或证据推理得出的，没有人直接告诉你。这里不比较understand常见的「理解，明白」这一义项。