Com.

例句：

1. 1. We must work together to achieve our goals.
   我们必须共同努力实现我们的目标。
2. 2. He and I have been working closely together for years.
   他和我多年来一直密切合作。
3. 3. The team members need to communicate effectively to ensure successful collaboration.
   团队成员需要有效沟通以确保成功的合作。