Database migration is a comprehensive activity as the volume of changes required might be huge.

数据库迁移是一种复杂的活动，因为可能需要做大量修改。

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Threshold, though a new feature, bases its migration of a volume on the threshold (default 95%). Following are a few quick facts on threshold migration.

阈值是一项新特性，它使一个卷的移植以阈值(默认为95%)为基础。

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And Darcy flow production equation with gas-bearing volume may reflect the characteristics of methane migration in coal measure strata more really.

把含气量引入达西流产量公式也许能更真实地反映甲烷气体在煤储层中流动产出的特征。

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