at a particular moment or period in the past when something happened, especially when the situation is very different now 当时
I was about ten or eleven at the time.
我当时大概十或十一岁。
Examples from the Corpus
at the time• Montaine was still living in the atticat the time.• Twenty two had activecolitisat the timeserum was obtained.• From what I learned of their disappearanceat the time, I never believed they would re-surface intact.• In fact, at the time it must have seemed a remarkably good idea.• A spokesman for the Housing Department would only say that the towerblocks had seemed a good idea at the time.• And I must admit I didn't know at the time exactly what her flyingweight should be.• Apparently, Shaw was not skiing with her husband or sons at the time of the accident, said Malik.• My view is that he combined two qualities that were, at the time of his ascendancy, regarded as mutually exclusive.