The models are kept in a secure repository (VOB) which offers history, traceability, roll-back, metadata and many more advantages.

模型保存在安全存储库(VOB)之中，它提供了历史，追踪性，回馈，元数据以及许多其他的优势。

Stateless services are unaware of transactional state; therefore they cannot be requested to "roll-back" a set of changes if a transaction fails.

无状态的服务意识不到事务状态，因此如果事务失败时，不能请求它们“回滚”一组变更。

The car began to roll back down the hill.

汽车开始倒着往山下滑。

One provision of the law was to roll back taxes to the 1975 level.

该法律的一项条款是把税收削减至1975年的水平。

If the code performing the actions decides not to commit or cannot commit successfully, then it must roll back the transaction to undo the actions.

如果代码执行的操作决定不进行提交或者不能成功提交，那么它必须回滚该事务以取消这些操作。