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.
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；
Memory cells were composed by half population with high affinity, and the half populations with low affinity in original generation were replaced.
选择亲和度高的一半细胞作为记忆细胞，利用其替换原始细胞群亲和度低的细胞。
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