例句與造句

1. by means of engineering examples, a comparison is made on the economy and environmental protection for four cooling and heat sources, including gas direct-fired machine, centralized heat-supply plus electric refrigerating, gas boiler plus electric refrigerating and air source heat pump plus gas peak-shaving boiler
   通過工程實(shí)例，對以燃?xì)庵比紮C(jī)、集中供熱電制冷、燃?xì)忮仩t電制冷、空氣源熱泵燃?xì)庹{(diào)峰鍋爐4種冷熱源的經(jīng)濟(jì)、環(huán)保性進(jìn)行了比較。
2. It's difficult to find fire machines in a sentence. 用fire machines造句挺難的