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健身所；健身房；体育馆
A gym is a club, building, or large room, usually containing special equipment, where people go to do physical exercise and get fit.
例句
While the lads are golfing, I work out in the gym.
小伙子们打高尔夫球的时候，我在健身房锻炼。
...the school gym.
学校体育馆