General is manually GHOST mistake, will hard disk partition mirror back to appear on the left.

一般是手动操作GHOST差错，将分区镜像恢复到悉数硬盘致使。

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General is manually GHOST error, will lead to partition the mirror back to the whole hard disk.

一般是手动操作GHOST错误，将分区镜像恢复到整个硬盘导致。

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Second, the free-boundary is handled by using combination of the zero-velocity method with the general ghost-image method and fourth-order difference format is used in free-boundary.

然后采用将零速度法和广义虚像法相结合的方法来处理自由边界，并在自由边界上采用四阶精度差分格式；

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