化学污染物的数量已经急剧上升。
The quantity of chemical pollutants has increased exponentially.
科学家推测，一个人大脑释放的这些化学物质的数量多少很可能表明这个人对他或她的医生有多大的信心。
Scientists theorized that the amount of these chemicals released by a person's brain quite possibly indicates how much faith the person has in his or her doctor.
对二恶英进行化学量化分析需要非常先进的方法，世界上只有数量有限的几个实验室能够做到。
The quantitative chemical analysis of dioxins requires sophisticated methods that are available only in a limited number of laboratories around the world.
应用推荐