add dynamic batch for fetch

雾聪

2024-04-19 63a70a00f7c9f162e8d7b3e330516438fb8cd87b

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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.