重点讲解：
1. be known as
称为；叫做；
eg. Obesity is one manifestation of a group of symptoms known as metabolic syndrome.
肥胖是称之为代谢综合征的一组症状群的一个症状表现。
eg. Asteroids, also known as " minor planets ", are numerous in the outer space.
小行星，亦称为“小型行星”，在外太空中不计其数。
2. see as
认为；把…看作；
eg. Others saw it as a betrayal.
别人认为这是一种背叛。
eg. Her assertiveness was starting to be seen as arrogance.
她的自信已开始被认为是自负了。
3. living proof of sth.
典型的例证；活生生的例子；
eg. He is living proof that some players just get better with age.
有些运动员年纪越大状态越好，他就是个活生生的例子。
eg. He is living proof of the wonders of modern medicine.
他是当代医学奇迹的活证明。