名词
中文翻译：Unknown
同义词：
['union', 'alliance', 'partnership', 'collaboration']
例句：
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1. The union has been working on a new policy for months.
工会已经工作了几个月的新政策。
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2. They formed an alliance to fight against the common enemy.
他们结成同盟来对抗共同的敌人。
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3. The company is collaborating with a partner to develop a new product.
该公司正与合作伙伴开发新产品。