understand的形容词

　　Warning notices must be readily understandable.

　　警告性标示必须明白易懂。

　　Roger Neuberg writes in a simple and understandable way.

　　罗杰·纽伯格的作品简单易懂。

　　The general response was one of understandable bafflement.

　　一般的`反应是，一次可以理解的受挫。