预迁移步骤非常重要，是实现成功迁移的关键。
The pre-migration steps are very important, and are key to a successful migration. In this section, you will do essentially three tasks.
迁移完成后，对数据库进行备份，如预迁移一节中的步骤一所示。
Backup your database after migration completion, as shown in step 1 of the Pre-migration section.
通过运行预迁移一节的步骤2中的相同命令收集所有数据库信息。
Gather all the database information by running the same commands as in step 2 in the Pre-migration section.
如果您改变了这些参数(如预迁移步骤中建议的那样)，您可以使用预迁移步骤3中保存的值将这些参数值恢复为原来的值。
If you changed these parameters, as recommended in the pre-migration steps, then you can use the values saved in step 3 of the pre-migration steps to adjust these parameters values back.
冷冻预油炸春卷经微波加热后，由于内部水分迁移，产品脆性下降。
Water transferring in springrolls on microwave reheating is a main factor that affects the crispness of frozen pre- fried springrolls.
冷冻预油炸春卷经微波加热后，由于内部水分迁移，产品脆性下降。
Water transferring in springrolls on microwave reheating is a main factor that affects the crispness of frozen pre- fried springrolls.
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