介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[11:58.51]The last reading.
[12:01.00]Earwax
[12:02.93]Experts say earwax protects and cleans the ear.
[12:08.16]It traps dirt and other matter and keeps insects out.
[12:13.51]Doctors think it might also help protect against infections.
[12:18.80]And the waxy ...

介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[11:58.51]The last reading.
[12:01.00]Earwax
[12:02.93]Experts say earwax protects and cleans the ear.
[12:08.16]It traps dirt and other matter and keeps insects out.
[12:13.51]Doctors think it might also help protect against infections.
[12:18.80]And the waxy oil keeps ears from getting too dry.
[12:23.59]There are two kinds of earwax.
[12:26.58]Most people of European or African ancestry have the "wet" kind,
[12:33.25]while East Asians commonly have "dry" earwax.
[12:39.41]The glands in the ear canal that produce the wax make too much in some people.
[12:46.06]Earwax is normally expelled and it falls out of the ear or gets washed away.
[12:52.91]But extra wax can harden and form a blockage
[12:56.66]that interferes with sound waves and reduces hearing.
[13:01.70]People can also cause a blockage when they try to clean out their ears,
[13:07.11]but only push the wax deeper inside.
[13:11.41]Earwax removal is sometimes necessary.
[13:14.89]But you have to use a safe method or you could do a lot of damage.