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重點講解：
1. be known as 稱為；叫做；
The disease is more commonly known as Mad Cow Disease.
這種疾病更通俗的名稱是瘋牛病。
2. care for 照料；照顧；護理；
She moved back home to care for her elderly parents.
她搬回家住，好照料年邁的雙親。
3. go down （價格、水平或數量）下降，下跌；
Crime has gone down 70 percent.
犯罪率下降了70%。
4. serve as 擔任（職務）；
He served as a captain in the army.
他曾是一名陸軍上尉。
