1、不清晰
as clear as mud 不清晰，混乱; 烂泥般糊涂的，不明显的，解释不清的，含糊不清的; 一点也不清楚..
2、混乱
... as clear as day 明若观火 as clear as mud 不清晰， 混乱 as close as a clam 一毛不拔 ...
3、极难理解的
... as blind as a bat判断力差，有眼无珠 as clear as mud极难理解的 asgoodasgold很乖，很听话 ...
4、不清楚
... all in all 常用的片语，表示"总的来说"，"总而言之"， as clear as mud 不清楚，混乱 as soft as down 柔软如绒毛 ...