... wall drinking fountain ==> 墙面饮水器 wall duct ==> 墙内风道 wall echo ==> 侧壁回波 ...
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墙内风道
Air duct in the wall
以上为机器翻译结果，长、整句建议使用 人工翻译 。
集中供热的发明要归功于古罗马。他们在公共浴池和私人别墅的墙内和地板内安装所谓火炕的风道系统。
The invention of central heating is often credited to the ancient Romans, who installed a system of air ducts called "hypocaust" in the walls and floors of public baths and private villas.
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