One of the most common reasons for dryness is simply the normal aging process.
引起干眼症的原因很多，其中最普遍的一个是正常的年龄增长。
You know, when I watch sci-fi movies I notice everyone has a normal aging pattern.
你知道，我看科幻电影时，注意到每个人都有一套正常的变老机制。
However, these are normal aspects of aging.
这些都是年龄增长的正常现象。
This is not a normal sign of aging.
这不是正常衰老的特征。
The study urges women not to accept those problems as a normal part of aging.
该项研究告诫女性，不要把以上列出的问题作为年纪增长的正常问题。
If you are over 60, it may just be a normal part of aging, u.
如果你已年过60，这只是年老带来的正常反应。
If you are over 60, it may just be a normal part of aging, u.
如果你已年过60，这只是年老带来的正常反应。
应用推荐