a muddy Brown的用法和样例：
- As a frog leaps from a bright green leaf to a muddy brown pond, the cells in its skin adjust the frog's hue to match and keep the frog hidden.
- I was driving my car along a muddy path.
- I was driving along a muddy path.
- The ambulance got stuck in a muddy side road.
- We drove along a muddy lane to reach the farmhouse.
- A muddy track through the forest.