Example sentences of "[adj] year [adv] at a time " in BNC.
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1 | Counting those in the bristle-cone pine establishes that some of these gnarled and twisted trees germinated over five thousand years ago at a time when man in the Middle East was just beginning to invent writing , and have remained alive throughout the entire duration of civilisation . |
2 | The Movement increased its membership from 5,000 in 1929 to 40,000 two years later at a time when the Communist Party was at its lowest ebb . |
3 | He became a protector of the species four years ago at a time when badger baiting had reached alarming proportions . |
4 | Three or four years perhaps at a time . |
5 | Modern human fossils 100000 years old are known and humans were widespread in southern Africa by 50 000 years ago at a time when Europe was still populated by the related Neanderthals . |