epoch
noun /ˈiːpɒk/
  /ˈepək/
 - (formal or literary) a period of time in history, especially one during which important events or changes happen
 synonym era时代;纪元;时期 - The death of the emperor marked the end of an epoch in the country's history.
皇帝驾崩标志着该国历史上一个时代的结束。  
Topics Timec2, Historyc2- Welfare reform was an epoch in the history of US social policy.
福利改革开辟了美国社会政策史上的一个新时代。  - an epoch of great social change
社会大变革的时代  - the importance of the computer in the present epoch
计算机在当代的重要性  
Collocations Dictionaryadjective- new
 - modern
 - present
 - …
 
- mark
 
- during an/the epoch
 - in an/the epoch
 - epoch of
 - …
 
- the beginning of an epoch
 - the end of an epoch
 
 - The death of the emperor marked the end of an epoch in the country's history.
 - (geology
 ) a length of time that is a division of a period地质学 世(地质年代,纪下分世) - geological epochs
地质世  
 - geological epochs
 
词源early 17th cent. (in the Latin form epocha; originally in the general sense of ‘a date from which succeeding years are numbered’): from modern Latin epocha, from Greek epokhē ‘stoppage, fixed point of time’, from epekhein ‘stop, take up a position’, from epi ‘upon, near to’ + ekhein ‘stay, be in a certain state’.