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重点讲解：
1. used to do sth.
过去常常；过去曾做某事；
eg. The bigger girls used to chase me and tickle me.
比我高大的女孩过去总是追赶着胳肢我。
eg. I used to live in London.
我曾经在伦敦居住过。
2. all of a sudden
突然地；出乎意料地；
eg. All of a sudden he let out a piercing shriek.
他突然发出一声尖叫。
eg. The wind dropped all of a sudden.
风突然停了下来。
3. slow down
（使）放慢；（使）减速；
eg. Slow down when turning a corner.
拐弯要慢行。
eg. They have learned that body systems slow down when you sleep.
他们得知，当人睡觉时，身体各系统的活动都放慢下来。
4. stop in one's track
（使）突然止步，突然停下；
eg. This magnificent church cannot fail to stop you in your tracks.
这座宏伟的教堂一定会让你止步赞叹。
eg. They stopped in their tracks and stared at him in amazement.
他们突然停下，惊讶地盯着他。
5. look back on
追忆；回顾；
eg. Someday we are going to look back on these days.
这种日子总有一天会过去的。
eg. I still shudder when I look back on the past.
想起过去，我仍然不寒而粟。
6. take place
（尤指在控制或组织下）发生，进行，举行；
eg. She wanted Hugh's wedding to take place quickly.
她希望休快点举行婚礼。
eg. The heart transplant will take place as soon as a suitable donor can be found.
一旦找到适宜捐献心脏的人，即可进行移植手术。
n. 追求，狩猎，争取
vt. 追捕，狩猎
