12点钟英文怎么表示啊

1点钟 one o'clock2点钟 two o'clock3点钟 three o'clock4点钟 four o'clock5点钟 five o'clock6点钟 six o'clock7点钟 seven o'clockeight o'clocknine o'clockten o'clockeleven o'clocktwelve o'clock。