speaking tube
柯林斯词典
1. N a tube or pipe for conveying a person's voice from one room, area, or building to another 房間與房間、建築與建築之間的通話琯
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1. N a tube or pipe for conveying a person's voice from one room, area, or building to another 房間與房間、建築與建築之間的通話琯