Finally, he had a speech that was interesting and perfectly understandable to his audience.
出自-2010年6月聽力原文
We need more scientists who can explain what they are doing in language that is convincing and understandable to the public.
2016年12月六級真題（第二套）閱讀 Section A
柯林斯高階英漢雙解學習詞典釋義
ADJ-GRADED
（行為、情緒等）可以理解的，正常的，合情理的
If you describe someone's behaviour or feelings as understandable, you think that they have reacted to a situation in a natural way or in the way you would expect.