英语语法分析

Vgreduce removes unallocated PVs from a volume group, reducing the vg.

vgreduce：从卷组中删除未分配的PV，这会减小vg。

Initially, all memory is red, which represents unallocated and uninitialized memory.

最初，所有的内存都是红色，这表示内存还没有被分配也没有初始化。

When that process is completed, the partition will be classified as an unallocated physical volume.

当该过程完成时，分区将分类为未分配的物理卷。