You can use a formal or informal version control system.

可以使用正式的或非正式的版本控制系统。

youdao

Requests are recorded either in change control systems, or even for more informal projects, particularly within eXtreme Programming projects, on CARDS or flip charts.

请求要么记录在变更控制系统中，要么对于更不正式的项目来说，特别是在极限程序设计项目中，记录在卡片上或活动挂图上。

youdao

This show the system can work well under most normal and informal situations. The stability and reliability of control system is highly improved.

证明该系统在绝大多数正常和非正常情况下均能可靠工作，极大的提高了控制系统的稳定性、可靠性。

youdao

The solutions are therefore to be found in formal (and informal) rules and regulations to control or eliminate perverse incentives in the market place, and in the governance structures of financial corporations.

ECONOMIST: Economic reasoning

On Sunday, Mahmoud Jibril outlined plans to put the various informal military units that have fought against Col Gaddafi under the control of the Transitional National Council.

BBC: Libya's interim PM feels the heat

The most obvious, and hardest to control, is the agenda-setting before the vote and the informal discussions that take place between ballots.

NPR: Arcane Process Encourages Papal Horse Trading