一旦杂质沉淀下去，油就可以分级了。Once its impurities had settled, the oil could be graded.将硫酸盐加入该溶液会产生沉淀.Adding sulphate to the solution will give a precipitate.渣滓沉淀在容器的底部.Dregs settled at the bottom of the container....
尽管很热，他还是脱掉工作服换上了西装和领带。Despite the heat, he'd swapped his overalls for a suit and tie.他身材高大，穿着西服打着领带，非常帅气。He was a big man, smartly dressed in a suit and tie.贾森已经脱下夹克，松开了领带。Jason had taken off his jacket and loosened...