时代(期) (时期)
period: It indicates any passage of time, great or small. /an extent of time of any length. (时代) time(s): It refers to a period in history. in ancient times/ in Victoria time (新时代)
epoch: It indicates a long period of time marked by events or development of a particular kind. The first flight into space marked a new epoch in the history of mankind. (纪元)
era: It refers to a very long period of time marked by a particular feature in a great new era of world revolution (时期)
age: It shows a particular /a fairly definite period in history. the Bronze Age, Iron Age
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