The two principal combustion products are water vapor and carbon dioxide.两种主要的燃烧产物是水蒸气和二氧化碳。The car windows were fogged with vapor.车窗上满是雾气。When nitric acid is poured on copper, a brown vapor gives off.将硝酸倒在铜上, 会散发出一种棕色的蒸...
Stand with feet hip - width apart, a dumbbell in each hand.双脚分开与臀部齐宽, 左右手各握一哑铃.The dumbbell will be raised 20 times by the sportsman tomorrow.明天,这个哑铃将被运动员举起二十次.Dumbbell exercises toned my muscles.哑铃操锻炼我的肌肉。The dumbbell w...