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重點講解：
1. be used to do sth.
過去常常；過去曾做某事；
eg. The test is used to diagnose a variety of diseases.
此項化驗可用于診斷多種疾病。
eg. Things ain't what they used to be.
現在情況不比從前了。
2. be known as
稱為；叫做；
eg. The disease is more commonly known as Mad Cow Disease...
這種疾病更通俗的名稱是瘋牛病。
eg. They're fond of holding what are laughingly known as literary soirees.
他們愛舉行戲稱之為文學晚會的活動。
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來。
eg. More bodies have been dug up at the site.
在那個地點又挖掘出幾具尸體。
n. 集中，專心，濃度
