This association (which need not be invariable) casts doubt on the optimistic assumption that the positive growthrateof a population is evidence that it has yet to reach its optimum.
这种连系（无须是一成不变的）令人对所谓正数增长率表示人口还没有达致最佳点的乐观假定感到怀疑。
2
Fourth, the theoretical model ofoptimum technological growthrate under discrete change is erected.
第四，构建了技术突变条件下的最优技术增长率模型。
3
Of course, a positive growthrate might be taken as evidence that a population is below its optimum.