名词
中文翻译：封闭式加热器
同义词：
['closed-loop heater', 'closed-circuit heater']
例句：
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1.The closed-type heater is designed tomaintain a constant temperature in the room.
封闭式加热器设计用来保持房间内恒定的温度。
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2.The closed-type heater is more energyefficient than its open-type counterpart.
封闭式加热器比其开放式的对应产品更节能。
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3. The closed-type heater iseasy to install and requires minimal maintenance.
封闭式加热器安装简便，维护需求低。