随着年龄增长，女性的生育能力会逐渐下降。

A woman's ___fertility tends to decline with age.

这片土地的肥沃程度令人惊叹，每年都能收获大量谷物。

The ___fertility of this land is amazing, producing abundant crops every year.

这位作家的想象力如此丰富，每部小说都充满了新颖的创意。

The writer's ___fertility of imagination fills every novel with fresh ideas.