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重点讲解：
1.once again再次
They once again held out on him when he asked to leave the army.
他退伍的要求再一次遭到了拒绝。
2.hammer out苦心想出；制定出
The forum should hammer out rules for a joint "crisis management mechanism" between the 27-nation bloc and Russia that could be both civilian and military in nature, Merkel said.
默克尔说，该论坛应为27国集团和俄罗斯之间的“危机管理机制”制定出一个联合的条例，该条例可为民用和军事性质的规则。
