例句：
They don't want people trampling the grass, pitching tents or building fires
他们不希望人们踩踏草坪、支帐篷或生火。
The houses are well spaced out, each on its own plot of ground and mat of coarse grass
房屋稀稀疏疏地坐落着，每栋都有自己的一片地和粗草坪。
Keep off the grass, please!
请勿践踏草坪！
Keep off the grass.
勿踩草坪。
开着拖拉机飚车
