fecundity          
noun [ U ]  formal uk/feˈkʌn.də.ti/ us/feˈkʌn.də.t̬i/
 繁殖力
the ability to produce a lot of crops, fruit, babies, young animals, etc.
  female fecundity 雌性繁殖力 
 This part of the state is a lush land of great fecundity. 该州这部分地区是一片丰饶的土地。 
  活跃;旺盛
the fact of producing or creating a lot of new things, ideas, etc.
  The play is yet another representation of his creative fecundity. 这部剧是他创作旺盛的又一代表。 
 The work combines a fecundity of imagination and a richness of poetical expression. 这部作品结合了旺盛的想象力和丰富的诗意表达。 
 See: fecund
 - More examples
 - In some species, fecundity rises with increasing age in the female.
 - The study is based on 10,000 marriages, showing the average fecundity of both sexes for different ages.
 - She has displayed remarkable literary fecundity, producing more than 20 books in three years.