重点讲解：
1. at the end of the day 最终；到头来；
例句：You are smiling,at the end of the day.
你终于笑了cTZ0q;d#;YEUl%X^;。
2. in the long run 从长远来看；
例句：It has been rather costly to install the machinery, but it should pay offin the long run.
安装这些机器要花的钱相当多，但从长远来说是上算的HtdTG*&J4daLZEtvglLG。
3. used to do sth. 过去常常；过去曾；
例句：Iused toswim all the year round.
过去我一年四季都游泳aI[H|9pC)]7lBe。
4. keep track of 跟上…的进展；掌握…的最新消息；
例句：We have tokeep track ofevery cent we spend.
我们得记下我们花的每一分钱~6%C|jeDjC8。
5. lose track of 跟不上…的进展；不再掌握…的最新情况；
例句：You become so deeply absorbed in an activity that youlose track oftime.
你会因过于专注某项活动而失去时间概念9;An^1Pg,cG-pi。