The author made an analytical study on the influence of the indoorweather to the peoples health according to the investigation and the statistical result on the gymnasiums in the north.
针对北方室内健身场馆进行了调查与统计，就室内气象对人体健康的影响进行了分析研究。
2
If the weather is wet or cold choose an indoor activity.
如果下雨或是天气寒冷，就选择室内活动。
《柯林斯英汉双解大词典》
3
Most campuses have some paths or a track for outdoor running, as well as treadmills and possibly an indoor track for bad weather or night running.