白内障是一种影响晶状体透明性的疾病。Cataracts is a condition that affects the transparency of the lenses.他是一位曾经动过白内障手术的老人.He is an elderly gentleman who had had a cataract operation.研究表明，即使抽烟不多的人也比不抽烟的人患白内障的概率高出一倍多。In one study, light smo...
他正在大学念动物学.He's studying zoology at university.她以毕生精力从事动物学研究.She devoted her lifetime to the study of zoology.对学生来说,动物学也是很重要的.Zoology is also a very important subject to the students....