如果在版本之间并没有不兼容变更，那么其中某些数据就会丢失。

If there were incompatible changes between the versions, some of the data will be lost.

youdao

提案中某些主要部分编写得很出色，但在合并由团队的多名成员编写的多个版本时丢失，这种实例已屡见不鲜了。

There have been many instances in which major, well-written portions of proposals are lost during the merging of multiple versions composed by multiple team members.

youdao

与新版本相关的对象和属性在向后迁移后将丢失，因此在运行新版本较长一段时间后最好不要进行向后迁移。

Objects or attributes relating only to the new version will be lost after a backward migration, and therefore you should not backward migrate after running the new version for an extended period.

youdao