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健身所；健身房；體育館
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.
小伙子們打高爾夫球的時候，我在健身房鍛煉。
...the school gym.
學校體育館