這大概是方言的讀音差異
有些方言裡面﹐明母字（m-）後面沒有 韻母 -u。
【 在 qqwd (qqwd) 的大作中提到: 】
: 是念mu還是mou﹖
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Example 3 Taking and destroying multiple snapshots
The following command creates a snapshot named "yesterday".
This snapshot is mounted on demand in the ".zfs/snapshot"
directory at the root of the "pool/home/bob" file system.
# zfs snapshot -r pool/home@yesterday
# zfs destroy -r pool/home@yesterday
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