种群的净增殖率、内禀增长率及周限增长率较高，而种群的世代周期及加倍时间偏低；
Its net reproductive rate, the intrinsic rate of increase and the increment rate per unit were high, but its generation span and the time of double population size were low.
蚜虫是一类刺吸式口器的小型昆虫，孤雌生殖、世代周期极短、繁殖率高，这使得蚜虫种群增长迅速。
Aphids are small sap-sucking insects whose parthenogenetic reproduction and short generation time allow them to increase population size rapidly.
桃属于多年生果树植物，由于世代周期长及其高度杂合性，使分子遗传作图不仅在理论上而且在育种实践上有十分重要的意义和价值。
Peach is a kind of the perennial fruit crop. For it's long period of a generation, molecular genetic mapping is very important theoretically and practically in breeding.
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