他们研究吸热的原理.They work on a principle of heat absorption.岩壁有时放热, 有时吸热.The rock walls sometimes supply heat, sometimes absorb it.在很高的温度下, 更多的吸热反应起作用.At very high temperatures, more endothermic reactions play a role....
It was certainly useful to have her there to chauffeur him around.有她在那儿还是挺有用的，能开车带他到处跑。He wrested the suitcase from the chauffeur.他从司机手里抢过手提箱。a long black chauffeur-driven limousine由专职司机驾驶的黑色豪华加长轿车...