at times,at a time,at one time,at the time的区别和用法
解答：at times:
有时；不时
[例句]
The tide is, at times, very high. 潮水有时涨得很高。 I like Bob but he's very annoying at times. 我喜欢鲍勃，但是他有时也很烦人。 The tide is at times very high. 潮水有时涨得很高。 She calls on me at times. 她有时来看我。
at a time
作“一次，每次”讲，常用于“
数词+at a time”的结构中。例如：
Enter two at a time.
每次进来两人。
He checked them off one at a time as they came in.
他们进来时，他一个一个地核对。
注意它与at one time 的区别。at one time一般指“过去某一时期，曾一度(once)”或“同时”的意思。如表示“同时”，则两者可通用。例如：
At one time I used to like her, but not any more.
我曾一度很喜欢他，现在可不喜欢了。 at the time:
(1) 那时 then [例句]
In 1969 the first men landed on the moon--I was twelve at the time. 一九六九年人类第一次登上月球——那时我十二岁。