boiler draft

例句：

1. 1.The boiler needs to be cleaned regularly to maintain its efficiency.
   锅炉需要定期清洗以保持其效率。
2. 2.The engineer calculated the boiler draft based on the pressure and temperature data.
   工程师根据压力和温度数据计算了锅炉风量。
3. 3. The new design of the boiler uses a more efficient draft system.
   新型锅炉采用了更高效的抽气系统。