A two-strain SIR epidemic model is discussed and an explicit formula for the basic reproductive number is derived by analyzing the local stability of the trivial equilibrium.
讨论了一类由两种不同病毒导致的SIR流行病模型，分析了平凡平衡点的局部稳定性，得到了基本再生数的数学表达式；
We found that marrying women 14.6 years younger maximized men's lifetime reproductive success—in other words, the number of offspring surviving to age 18.
我们发现，如果一个男人和比自己小14.6的岁女人结婚，那么他的后代的数量，即那些活到18岁的后代的数量将是最多的。
According to relevant statistics, the number of the dispute is at the rate of 30% every year, rapid spread a serious threat to human reproductive health.
据相关资料统计，非淋的发病人数正以每年30%的速度快速漫延，严重威胁着人类生殖健康。
The number of reproductive ramets of P. tenuiflora for cutting were 2.05times.
籽实成熟期生殖蘖数量割草地是放牧地的2.05倍。
We found that marrying women 14.6 years younger maximized men's lifetime reproductive success-in other words, the number of offspring surviving to age 18.
我们发现，如果一个男人和比自己小14.6的岁女人结婚，那么他的后代的数量，即那些活到18岁的后代的数量将是最多的。
The number of reproductive individuals existing in a dormant state is significantly greater than that of aboveground individuals in most habitats dominated by higher plants.
在高等植物占据的大多数生境中，以休眠繁殖体形式存在的个体远远超过地上植株的数量；
The performances of the change in reproductive behaviour are the number of births, fertility preferences and other aspects , which will surely lead to changes in the structure of the family.
生育行为的变化则外化为生育数量、生育偏好等方面的转变，转变的结果是家庭结构的变化。
Objectives to develop a highly sensitive and reproductive test for the number of complement receptor 1 on erythrocytes (ECR1), and to investigate the significance of ECR1 in immune relative diseases.
目的为临床常规检验和进一步研究红细胞补体受体1型(ecr1)，建立一种敏感、特异和重复性良好的定量测定方法。
Many factors can result in male infertility, and a number of studies have indicated that reproductive difficulties are associated intimately with cytogenetic abnormalities.
引起男性不育因素很多，大量研究已经表明男性不育与细胞遗传学异常有关。
Even women infected with HIV and reproductive marriage, as the probability of mother to child transmission around 30 percent, there is still a considerable number of babies will die in AIDS.
即便是女性艾滋病病毒感染者结婚生育，由于母婴传播的概率在30%左右，仍有相当一部分婴儿将夭折于艾滋病。
The number of the vegetative shoots and stolons and distance between the two adjacent reproductive nodes and stolons were not significant difference between light grazing and fence plot.
营养枝数、不定根数、匍匐茎、子间距和节间距在封育区和轻牧区相互间无差异，且营养枝数和不定根数在两样区最多。
Among those who had stayed with one partner during their reproductive lives, they found that the peak number of children was born to women with partners four years older than themselves.
在那些生育年龄中只有一个伴侣的人中，他们发现女性和比她们大四岁的伴侣生育的孩子最多。那些伴侣小他们六岁的男性，孩子数量最多。
Reproductive cloning technology could also be used to a large number of valuable genes.
克隆技术还可用来大量繁殖有价值的基因。
Reproductive cloning technology could also be used to a large number of valuable genes.
克隆技术还可用来大量繁殖有价值的基因。
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