如果人类的基因库被视为一种物种的自然来源，那么明智的做法就是要倍加小心地去培养、保护那些最罕见的基因。这样，每一代人都会从中受益。

• If the human gene pool can be seen as a sort of species-wide natural resource,it's only sensible for the rarest of those genes to be husbanded most carefully,preserved so that every generation may enjoy their benefits.