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....
如果你的体液与染有HIV者 的体液接触,你就会染上艾滋病.You can contract Aids if your bodily fluids come into contact with the bodily fluids of someone else who is infected with HIV.体液一蒸发, 身体就凉快.The fluid evaporates, and the body is cooled.体液性因素由各...
The audience were mostly adolescents.听众几乎都是年轻人。It is no use simply to tell adolescents to shape up and do something useful.仅仅告诉青少年要品行端正，做有意义的事，是没有用的。Adolescents are most likely to get into trouble when they're at a ...