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重点讲解：
1. be used to do sth.
过去常常；过去曾做某事；
eg. The test is used to diagnose a variety of diseases.
此项化验可用于诊断多种疾病。
eg. Things ain't what they used to be.
现在情况不比从前了。
2. be known as
称为；叫做；
eg. The disease is more commonly known as Mad Cow Disease...
这种疾病更通俗的名称是疯牛病。
eg. They're fond of holding what are laughingly known as literary soirees.
他们爱举行戏称之为文学晚会的活动。
3. dig up
挖出；掘起；
eg. You would have to dig up the plant yourself.
你得自己把那株植物挖出来。
eg. More bodies have been dug up at the site.
在那个地点又挖掘出几具尸体。
n. 集中，专心，浓度
