fix speed_perturb bug

haoneng.lhn

2023-06-05 0b729cd5744e514ff95c5c8bc9378136b1ccb750

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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.