using the metric tensor , one may form compontents of other variances. 利用度量张量还可以构成其它变异的分量。
He specifies above a dozen characters which may be found varying even on the same branch . 他指出在同一枝条上进行变异的12种以上的特征。
He argued that organisms evolve gradually by accumulating small hereditary changes . 他论证说,生物是由于一些小的遗传变异的积累而逐渐演变的。
It serves to acknowledge plainly our ignorance of the cause of each particular variation . 这也明显地表示出,我们对于每一特殊变异的原因是茫然无知的。
I think it will be admitted by naturalists, without my entering on details, that secondary sexual characters are highly variable . 我想无须详细讨论,自然学者都公认副性征是高度变异的。