abnormal [反]normal

　　adj. very different from usual in a way that seems strange, worrying, wrong, or dangerous反常的，变态的

　　an abnormal level of cholesterol胆固醇值不正常

　yield

　　①v. to produce or provide sth. ，for example a profit, result or crop出产（作物）；产生（收益、效益）

　　The research has yielded useful information. 这项研究提供了有用的资料。

　　②n. the total amount of crops, profits, etc. that are produced产量；产出；利润

　　Subsidies for pesticides and artificial fertilizers encourage farmers to use greater quantities than are needed to get the highest economic crop yield. 政府在杀虫剂和人造化肥上的补贴鼓励了农民对其过量使用以达到的经济作物产出量。