They picnic, they barbecue, and they just sit on the grass and relax.

他们野餐，露天烧烤，坐在草地上放松。

youdao

A boy and a girl sit on the grass.

一个小伙子和一个姑娘坐在草地上。

youdao

After we have finished tea, we will sit on the grass.

喝完茶之后我们将坐在草地上。

youdao

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

Sit on the grass and watch the bats swoop across the dusk skyline to give a dramatic air to the evening.

BBC: Cinetastic Melbourne

There is also the idea in tomboyism that you have chosen comfort over flirtation, ease over fussiness, a button-down shirt you've grabbed off the floor over a skirt you can't sit on the grass in.

WSJ: Girls Will Be Boys | Fashion