Definition: happening, used or situated inside a building Level: A2
下雨天，我们就在室内玩。
On rainy days, we play ___indoor games.
这个游泳池是室内的，所以冬天也可以游泳。
This is an ___indoor swimming pool, so we can swim in winter.
学校有一个很大的室内体育馆。
The school has a big ___indoor sports hall.
