union function

例句：

1. 1. The union of the two countries has brought about significant economic benefits.
   两国的联合带来了显著的经济益处。
2. 2. The union of different cultures is essential for global harmony.
   不同文化的联合对于全球和谐至关重要。
3. 3. The union of the workers and management was a turning point in the company's history.
   工人们和管理层的联合是公司历史上的一个转折点。