USE OF 室 shì
1. It's used for the room as an administrative or working unit.
Example :
画室 huàshì Studio
诊室 zhěnshì doctor's office
保管室 bǎoguǎnshì storeroom
教室 jiàoshì classroom
科室 kēshì administrative office
2. It can be used serial number of apartment.
七号楼106室
Qī hào lóu 106 shì
Room 106, Building 7
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