a carpet of green grass的用法和样例：
- There are vast lush Lin, a snow mountain glaciers, there is a vast carpet of green grass prairie, the world's rare and unique breed - Tianzhu white yak.
- Abuts from Hangzhou to Ningbo highway and from Hangzhou to Ningbo railroad, the transportation is convenient, in the factory the trees are luxuriant, the carpet of green grass, is a modernized garden type factory.
- A carpet of leaves covered the ground.
- The plaza in festival is a carpet of flowers.