playground
/ˈpleɪgraʊnd/noun
1- an outdoor area provided for children to play on, especially at a school or public park（尤指学校或公共公园里供儿童玩耍的）运动场, 操场; 游乐场。
1.1
- a place where a particular group of people choose to enjoy themselves活动场所：
the mountains are a playground for hang-gliders.
那些山是悬挂式滑翔机爱好者的活动场所。