at one time 与 at that time 的区别

at one time 一次
you can't do all the things at one time

at that time 那时
i saw him on campus at that time

at one time: 仅仅是指过于的某一段时间,不是特指
ad. 有一时期(一次,曾经)

1. He was at one time so devoted to piano playing.
他曾经那么沉迷于弹钢琴。

2. The two continents were connected by a land mass at one time.
这两个大陆曾经由一大片陆地连接着。

3. All the copies of a publication printed at one time from the same set of type.
印数，印次用同一个版本一次印刷的所有印刷物

4. An amount of food taken into the mouth at one time; a mouthful.
一口食物；一口，少量一次吞入口的食物量；一口的量

5. It's a physical impossibility to be in two places at one time.
同时在两地是自然规律上不可能的事。

6. At one time, she is fine, but at another, she is abnormal.
有时候，她表现得很好，有时候又失常。

7. My brain can't hold so much information at one time.
我脑子一下子记不住这麽多信息.

at that time: 是指在过去某段特定的时间,是特指哦
ad. 在当时

1. It i