at + 点钟,如：at six o'clock,或固定搭配：at night,at noonin + 年/月/季节,如：in 2010,in July,in winter,in the morningon + 星期/ 日子,如：on Sunday,on a cold winter day,on July 2,2010...
at + 点钟,如：at six o'clock,或固定搭配：at night,at noonin + 年/月/季节,如：in 2010,in July,in winter,in the morningon + 星期/ 日子,如：on Sunday,on a cold winter day,on July 2,2010...