modify readme for sond

志浩

2023-02-13 0f6296ff128dad4e68d7e7211daed7f2011595de

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.