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重点讲解：
1. pull out 脱离；退出
The project became so expensive that we had to pull out.
这个项目变得耗资巨大，我们只得退出。
2. in partnership with 与......合作
He developed his own program in partnership with an American expert.
他与一位美国专家合作开发出自己的程序。
3. run out of sth. 用完某物，耗尽某物
We ran out of fuel.
我们把燃料用光了。
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