重點講解：
1. used to do sth.
過去常常；過去曾做某事；
eg. We used to be good friends, but fell apart about a year ago.
我們過去曾經(jīng)是好朋友，但一年前關系破裂了Yc=b#Zkw|Bo2T]xB。
eg. John used to visit his parents once a week when he worked as an assistant in the city.
約翰在城里當服務員的時候，總是每周去看望父母一次3Ox;u+iupsqO%_t。
2. stay up
深夜不睡；熬夜；
eg. People often do not sleep on the last day of year and stay up to welcome the new year. We call it pernoctating.
守歲，就是在舊年的最后一天夜里不睡覺，熬夜迎接新一年的到來*E~NZcJgAL[s.r%2|h.r。
eg. I hope you will not always stay up late, but form a good habit of early to bed, early to rise.
我希望你不要總是熬夜，要養(yǎng)成早睡早起的好習慣iVBL36w=zt#。
3. one by one
逐個地；依次地；
eg. Researchers, sometimes working more or less in teams, divide problems into small pieces and try out different solutions to them one by one.
有時候，研究人員或多或少地分組合作，把問題分解并且逐個找到相應的解決辦法0wTm|[WH~6G9)I68Iwi!。
eg. All the applicants were interviewed one by one.
所有的申請者一個接著一個參加面試TtbZZ7e9)9i。