She was silent, her eyes downcast.她一言不发，两眼低垂。Barbara looked increasingly downcast as defeat loomed.当败象已呈时，芭芭拉看上去越来越沮丧。Eyes downcast, she continued eating.她低垂双眼，不停地吃。...
Once its impurities had settled, the oil could be graded.一旦杂质沉淀下去，油就可以分级了。Passes are graded from "A" down to "E".及格分为A到E几等。The texts should be graded in order of difficulty.课文要按难易程度编排....
准备出国者均需注射伤寒预防针.Everyone who is going abroad will need to be immunised against typhoid.继而爆发了伤寒.An outbreak of typhoid followed.环境卫生搞不好,伤寒就会乘虚而入.Typhoid fever sneaks in when sanitation fails....