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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However, an embarrassing debacle for the army on the border with Israel, where 16 Egyptian troops were killed by Islamist militants a week ago, may have given Morsi the opening he needed to step up the pace in rolling back the military's influence, pushing aside Tantawi and military chief of staff Sami Enan.

MSN: New Egyptian president orders military chief to retire

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