at a time什么意思
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at时间表什么意思
1. at:(1)用在钟点前，表示“在……”如：at six,at five thirty,at half past nine(2)固定短语:at night,at noon,at this time of day,at the age of,at weekends 2. on:用在具体的某一天或某一天的上午、下午、晚上前，如：on Monday,on Saturday afternoon,on...
1. at:(1)用在钟点前，表示“在……”如：at six,at five thirty,at half past nine(2)固定短语:at night,at noon,at this time of day,at the age of,at weekends 2. on:用在具体的某一天或某一天的上午、下午、晚上前，如：on Monday,on Saturday afternoon,on...