1. an eye disease that involves the clouding or opacification of the natural lens of the eye

2. a large waterfall; violent rush of water over a precipice

1.白内障
cataracts are layers over a person's eyes that prevent them from seeing properly. cataracts usually develop because of old age or illness.

cataract的解释

e.g. In one study, light smokers were found to be more than twice as likely to get cataracts as non-smokers...
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。
e.g. Age is not a factor incataract surgery.
年龄并不是影响做白内障手术的因素。

2.大瀑布
Acataract is a large waterfall.

1. 白内障：白内障(cataract)晶状体混浊称为白内障.老化遗传代谢异常外伤辐射中毒和局部营养不良等可引起晶状体囊膜损伤使其渗透性增加丧失屏障作用或导致晶状体代谢紊乱使晶状体蛋白发生变性形成混浊.分先天性和后天性.

2. 大瀑布：他们穿过很多美丽的峡谷,绕过无数大瀑布(cataract)、激流(rapid)和瀑布(waterfall). 带着仅有的两艘船,和几乎完全耗尽的给养,剩余的六个人终于到达了维尔京河(Virgin)的摩门教定居点. 这里,是他们一百天探险的终点.

3. 内障,白内障：白内障白内障(cataract)晶状体混浊称为白内障,石家庄联谊医院是专业治疗白内障疾病的专科医院. 采用中西医结合治疗老化、遗传、代谢异常、外伤、辐射、中毒和局部营养不良等引起的白内障疾病效果卓著.

4. 瀑布：而聚合影相於视网膜,并可过泸掉紫外线. 水晶体的这个适应性在 40 岁起会逐渐退化,这现象也就是老花眼. 同时水晶体也随年龄逐渐氧化混浊,造成好像是从瀑布 (cataract) 后方看东西,这现象也就是白内障 (cataract).