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重点讲解：
1. in an effort to 企图；试图要...
The company has laid off 150 workers in an effort to save money.
公司为节省资金遣散了150名工作人员。
2. comply with 遵守；照做
They refused to comply with the UN resolution.
他们拒绝遵守联合国的决议。
3. in return for 换取...；作为...的报答
Can I buy you lunch in return for your help?
感谢你帮忙，我请你吃午饭好吗？
4. In addition 此外
In addition, the talkers used code words.
此外，谈话者使用暗号。
