Rails reverses each migration step in order, rolling back the changes for the largest migration first, eventually downgrading the database to version 0 as specified.

Rails按顺序逆转每个迁移步骤，首先回滚最近的迁移，最终将数据库回滚到版本0。

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But scrum-half Simpson reacted sharpest to deny the Welsh star, smothering him and rolling him onto his back with the sort of two-step rarely seen on any dance floor.

BBC: Saracens 13-6 Wasps