handshake flag

例句：

1. 1.The handshake flag is used to indicate a friendly greeting between two people.
   握手旗用于表示两个人之间的友好问候。
2. 2. During the handshake, both parties exchanged their business cards and discussed potential collaborations.
   握手期间，双方交换了名片并讨论了潜在的合作机会。
3. 3. The handshake flag was raised in recognition of the successful completion of the project.
   举起握手旗是为了认可项目的成功完成。