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重点讲解：
1. look back
追忆；回顾；
例句：Looking back, I am staggered how easily it was all arranged.
回头一想，我惊异地发现这一切的安排竟是如此简单。
2. focus on
集中（注意力）；关注；
例句：We should focus on day-to-day work.
我们要把主要精力放到经常工作方面。
3. in order to
为了；以便；目的在于；
例句：He is cautious in order to get promoted.
他为求升迁而小心谨慎。
4. in reality
事实上；实际上；
例句：We thought he was serious but in reality he was joking.
我们以为他是认真的，但实际上他是在开玩笑。
n. 迁移，移动，换车
v. 转移，调转，调任
