You choose the object you want and move it to where you want it, only to have it end up in a different position.

你选定一个对象，并想移动到自己期望的地方，结果却是到了一个不同的位置。

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When you move an object on SSD, if insufficient space exists on SSD, only part of the object will end up on SSD.

当将对象移动到SSD时，如果SSD中的空间不足，那么将只有部分对象会存储到SSD中。

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Each change in the database schema has its own migration object, encapsulating a move up and a move down. Listing 1 shows an empty migration.

数据库模式中的每个变化都有自己的迁移对象，迁移对象包装了前进和后退。

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