indoors/ˌɪn'dɔːz $ -'dɔːrz/

ad. within or into a building

ad. 在室内，在屋里；往室内：The heavy rain kept me indoors all day. 大雨使我一整天都待在屋里。

◇He went indoors to fetch a camera. 他进屋取了个相机。

构词in- + doors