mud的形容词形式muddy；
muddy：adj.多泥的；泥泞的；含泥的；浑浊的；
v.使变得泥泞
They left the car and struck out along the muddy track
他们下了车，然后开始沿着泥泞的小路往前走。
It's difficult enough without muddying the issue with religion.
即使不把宗教牵扯进去，这个问题也已经够棘手的了。
The paper has turned a muddy colour.
报纸已变成土黄色了。
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