schoolyard

校园、操场、学校空地

The children played tag in the schoolyard during recess.

下课时间，孩子们在操场上玩鬼抓人。

幼稚的、孩子气的多作名词前修饰

Their debate quickly sank to the level of schoolyard insults.

他们的辩论很快就沦为幼稚的互相叫骂。