Catarct
白内障
🗣️ 情景例句
Absolutely.
绝对是真的。
That man is a teacher,isn't he?
那个人是位教员，对不对？
If they knew how difficult it was to drill through the hard rock, they would lose heart.
如果他们知道了钻透那坚硬的岩石有多么困难，他们会丧失信心的。