1. The new HVAC system in our house is ductless, which means we don't have to worry about cleaning or repairing ducts.
我们家的新暖通系统是无管道的，这意味着我们无需担心清洁或修理管道。
2. The ductless mini-split air conditioner provides efficient cooling and heating without the need for bulky ductwork.
无管道的分体式空调提供高效冷暖，无需笨重的管道工程。