Unlike men, whose testicles can produce a virtually "unlimited" number of sperm even at 50 or 60, and who demonstrate a reproductive vigor "like dragons," a woman's fertility is more like a "warehouse," with a limited capacity and with stores that are slowly exhausted over time.
有別於男性精子是由睪丸隨時「無限大量製造」，即使到五、六十歲，生育能力還可能「親像一尾活龍」；而女性卵子則是「有限庫存」的概念，隨著年齡增長將逐漸消耗。