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重点讲解：
1. be known as 称为；叫做；
The disease is more commonly known as Mad Cow Disease.
这种疾病更通俗的名称是疯牛病。
2. care for 照料；照顾；护理；
She moved back home to care for her elderly parents.
她搬回家住，好照料年迈的双亲。
3. go down （价格、水平或数量）下降，下跌；
Crime has gone down 70 percent.
犯罪率下降了70%。
4. serve as 担任（职务）；
He served as a captain in the army.
他曾是一名陆军上尉。
