They picnic and they barbecue, and just sit out on the grass and just relax. You know it's a beautiful park.

他们在那里野餐，露天烧烤，或者简单地坐在草地上放松。那是一个很美的公园。

河滨公园 - SpeakingMax英语口语达人

so you play on a grass as opposed to on the clay

所以，你在绿茵场上比赛，而不是在粘泥土上，

世界级网球比赛 - SpeakingMax英语口语达人