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重点讲解：
1. hang out 闲逛，逗留；
例句：Dave is hanging out with his friends at a bar.
戴夫正和他的朋友在酒吧里玩。
2. set up 创建；建立；安排；组建；
例句：We are planning to set up a publishing house.
我们正打算建立一家出版社。
3. would love to do sth. 乐于；很愿意；
例句：I would love to invite her to the party next Sunday.
我想在下星期天邀请她来参加晚会。
4. work out (如期）发生；进展(顺利)；
例句：Things will only work out if we all keep to the plan.
只有大家执行计划，事情才能成功。
n. 概念，观念
