understandable

Compared meaning: easy to understand (adjective).

比较义项：容易理解、能够被理解的（形容词）。

• accessible

  Describes writing, teaching or media designed to be easy for ordinary people (not experts) to follow; typically paired with 'accessible to' + an audience, and focuses on how clearly something is presented.

  指写作、教学或媒体设计得让普通人（非专业人士）也容易理解；常见搭配是“accessible to＋读者”，强调内容呈现方式是否清晰易懂。

  The professor's accessible lectures make quantum physics easy for beginners to grasp.

  这位教授的课通俗易懂，让初学者也能轻松理解量子物理。

• understandable 本词

  Broader: means capable of being understood, and is often used about feelings, reactions or mistakes to say they make sense or are reasonable given the situation, not just about clear writing.

  含义更广：表示能够被理解，也常用来形容情绪、反应或错误，表示在特定情况下这是合情合理、可以理解的，而不仅仅指文字清楚。

  His confusion about the new tax form is completely understandable.

  他对新税表感到困惑，这完全可以理解。

Accessible and understandable both mean easy to understand, but differ in use. Accessible describes writing or teaching made clear for ordinary readers. Understandable is broader, used for feelings, reactions, or mistakes that make sense. This does not cover accessible meaning easy to reach or enter.

这两个词在“容易理解”这个意义上很接近，但用法不同：accessible强调内容或表达方式对普通读者来说清晰易懂，常见搭配是“accessible to＋读者”；understandable范围更广，除了指内容能被理解外，也常用来说某种情绪、反应或错误是合情合理、可以理解的。这里不比较accessible的“（场所等）无障碍的、可进入的”这一义项。