fertile: implies the power to reproduce in kind or to assist reproduction and growth: ~ soil; or it may suggest readiness of invention and development: a most ~ imagination. （fertile 1、助生长able to support the growth，如fertile farmland/soil肥沃的农场/土地 2、生育能力强able to produce children or young animals, etc，如healthy fertile women/men生育能力强的女/男人，a fertile egg受精卵，如fertility test/drug生育力检测/药物，如fertile mind/imagination丰富的思维力/想象力）
fecund: emphasizes abundance or rapidity in bearing fruits or offspring, or projects, inventions, or works of art: came from a remarkably ~ family.
fruitful: adds to fertile and fecund the implication of desirable or useful results: undertook ~ research in virology. 病毒学 如a fruitful collaboration/discussion/relationship/landscape富有成果的合作/讨论/关系/硕果累累的景色 反义词fruitless表示在长时间努力的情况下仍未取得结果，因此很失望
prolific: stresses rapidity of spreading or multiplying by or as if by natural reproduction: one of the most ~ writers of science fiction. multiply乘法倍增，表示增长速度快 （另一个词proliferate，词形和词义都很接近，也是表示快速增长to increase in number or amount quickly, 如problems have proliferated recently近期出了很多问题（即快速增长），如the proliferation of nuclear weapons核武器扩散）
fertile肥沃能生育: 指生育能力强，或助生长，或有创意，fecund能生育多产: 和fertile同义，更强调大量或快速，fruitful富有成果: 进一步指取得了期盼的成果，prolific多产: 强调快速产出，像自然繁殖一样
记忆方法: 1）首字母FFFP丰沛丰富<==多产
2）多产的意思是生育能力强mean producing or capable of producing offspring or fruit.
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