What is the stem of the return of ten-year veterans?

It is a common saying in the game CF, which indicates the return of old players.

Crossfire (CF) is a multiplayer online first-person shooter online game developed by Korean Smile Gate Company and operated by tencent games, a subsidiary of Tencent Company. The game tells the story of the duel between the black list and infiltrators of two international mercenary organizations in the world. The game has many modes, such as team competition mode, team competition mode, blasting mode, ghost mode, biochemical mode, challenge mode and so on. And launched an instant joining system in the form of "lack of people to make up".