Finally, he had a speech that was interesting and perfectly understandable to his audience.
出自-2010年6月听力原文
We need more scientists who can explain what they are doing in language that is convincing and understandable to the public.
2016年12月六级真题（第二套）阅读 Section A
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
（行为、情绪等）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.