foul the trail

例句：

1. 1. The campers were found to havefouled the trail with their trash.
   露营者被发现用他们的垃圾破坏了小径。
2. 2.The children were warned not to foul thetrail with their toys.
   孩子们被警告不要在小径上留下玩具痕迹。
3. 3. Thehikers were caught fouling the trailwith their litter.
   徒步旅行者被发现留下了垃圾痕迹。