9:00 nine o'clock (表示整点时o'clock可省略)
11:00 eleven o'clock
2:45 forty-five past two 或 a quarter to three 或 two forty-five
4:20 twenty past four 或 four twenty
ps：如果知道时间在上午，可在时间后加a.m.
下午的话，就加上p.m.
ps1：时间一般和介词at连用，放在时间之前。
nine o'clock
eleven o'clock
a quater to three/ two forty five
twenty past four/four twenty
nine o'clock
eleven o'clock
a quater to three
twenty past four
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