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located, done or used inside a building （在）室内的；在戶内進行的；在室内用的 an indoor swimming pool 室内遊泳池 indoor games 室内遊戲 Poor indoor air quality can result in increased risk of asthma and allergies. 室内空氣質量差會導致哮喘和過敏的風險增加。
Oxford Collocations DictionaryIndoor is used with these nouns:- arena
- athletics
- court
- …
relating to sports played indoors 室内： 與室内運動有關the world indoor 200 metres champion 室内 200 米賽世界冠軍
Word Originearly 18th cent. (superseding earlier within-door): from in (as a preposition) + door. Compare with indoors.