at a time ,at one time ,at the time ,at all times四者之间的区别和联系,既具体的意思解释.

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atatime,atonetime,atthetime,atalltimes四者之间的区别和联系,既具体的意思解释.atatime,atonetime,atthetime,atalltimes四者之间

at a time ,at one time ,at the time ,at all times四者之间的区别和联系,既具体的意思解释.
at a time ,at one time ,at the time ,at all times四者之间的区别和联系,既具体的意思解释.

at a time ,at one time ,at the time ,at all times四者之间的区别和联系,既具体的意思解释.
at a time :一次;每次;在某时
Let your listener answer one question at a time.
让你的听众一次回答一个问题.
at one time :曾经,一度;同时(大多时候可以同at a time 替换)
All showed signs that,at one time,they had been active.
所有迹象表明,它们曾一度活跃过
at the time :在那时,那时候
At the time,printing itself was not a new idea.
在当时,印刷术本身并不能算是一个新想法.
at all times:一直;始终
Please pay attention to them at all times.
请随时注意遵守这些规则.