Revert "shfit to shift (#2266)" (#2336)

zhifu gao

2024-12-25 3f8294b9d7deaa0cbdb0b2ef6f3802d46ae133a9

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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.