名词
中文翻译：Unknown
同义词：
['HVAC', 'HVAC system']
例句：
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1. The new HUD has been designed to improve energy efficiency.
新的暖通空调系统被设计来提高能源效率。
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2. The construction of the HUD is expected to start next month.
预计暖通空调系统的建设将于下个月开始。
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3. The HUD controls the temperature and humidity in the room.
暖通空调控制着房间的温度和湿度。