easy to understand;understandable ❍ 他有丰富的历史知识，引用生动的故事，讲得深入浅出，～，难友们都听得十分迷醉。(杨植霖《王若飞在狱中》46) He had a rich knowledge of history and would cite vivid historical instances to make his talk at once profound and understandable,thus fascinating every listener.
通俗易懂tōnɡ sú yì dǒnɡ
形容适合普通水平，大家都能接受。easy to understand, understandable, popular and easy-to-understand