例句與造句

1. This seldom occurs in nature : localisation of gamete exchange  through dispersal limitations, preferential mating, cataclysm, or other cause  may lead to small actual gamodemes which exchange gametes reasonably uniformly within themselves, but are virtually separated from their neighbouring gamodemes.
2. It's difficult to find preferential mating in a sentence. 用preferential mating造句挺難的