回答
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When the heater is on, I get hot, but then, if I turn it off, I get cold.
暖房 = (indoor) heating, the heat, the heater
暑くなる = I get hot, it gets hot in here (get = become)
回答
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It gets too hot when I turn on the heater, but it gets too cold when I turn it off.
- "It gets too hot when I turn on the heater, but it gets too cold when I turn it off."
ここでは、「暖房をつけると暑くなってしまうけど、消すと逆に寒くなってしまう」という意味になります。「turn on the heater」は暖房をつけることを、「turn it off」はそれを消すことを指します。