"a prolific writer" "a fecund imagination"
"flying foxes are extremely prolific" "a prolific pear tree"
"fertile farmland" "a fat land" "a productive vineyard" "rich soil"
The soil..was fertile and needed only water to make it productive.
The sense of injustice arising from gross inequalities..is a fertile source of discontent.
The number of children that a fertile couple have depends on..the efficiency of the contraceptive methods they use.
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)