一般情况下，代码质量对迁移的复杂性不会有直接的影响。
In general, code quality does not have a direct impact on migration complexity.
不过是一般的Rails迁移罢了。
这部分内容是有关迁移的一般性指导信息。
General instructions. This content is a general guideline for the migration.
语言迁移一般有两种：即正迁移和负迁移。
The language transfer has two kinds, including positive transfer and negative transfer.
语言迁移一般有两种：即正迁移和负迁移。
The language transfer has two kinds, including positive transfer and negative transfer.
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