mild-steel domestic boiler

例句：

1. 1. This new model of mild-steel domestic boiler is designed for energy efficiencyand environmental protection.
   这款新型的温和钢铁家用锅炉设计用于节能和环保。
2. 2. Themanufacturer claims that the mild-steeldomestic boiler has a longer lifespan thantraditional models.
   制造商声称，这种温和钢铁家用锅炉的使用寿命比传统模型更长。
3. 3. Dueto its energy-saving features,the mild-steel domestic boiler isbecoming increasingly popular in China.
   由于其节能特性，这种温和钢铁家用锅炉在中国越来越受欢迎。