at a time通常用于指代某个特定的时间段或者顺序中的一个部分。它可以用来描述需要逐个进行的事情,比如在一次会议中每个人都有机会发言,可以说Everyone will have a turn speaking at a time.或者The candidates answered questions at a time.
at one time则通常用来表达过去的一个状态或情况,意味着在某个特定时期内发生过的事情。例如,如果某人曾经是某个组织的成员,可以说He was a member of that organization at one time.或She used to live here at one time.
1、Let's attack one problem at a time.
咱们一次全力处理一个问题。
2、Beat in the eggs, one at a time
打入鸡蛋,一次一个。
3、You can check your program one command at a time while it's running.
你可以在程序运行期间,逐条输入命令以对程序进行检查。
1、The fish lay thousands of eggs at one time.
这种鱼一次产卵数千个。
2、Criminals could at one time be sentenced to penal servitude.
曾经有个时期,罪犯可以被判服劳役刑。
3、At one time, walking across the room took all her strength
曾经有段时间她得费尽全力才能从房间一头走到另一头。