update TimestampSentence & TimestampIsPunctuation

雾聪

2023-12-20 5071e7b4b629338f84ca21ba0c9cdb12e68213d7

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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.