But evolution also requires repeated replication and mutation to generate the variation upon which selection works to give adaptive solutions.

但是进化还需要反复复制和突变产生赖以选择的变异，从而给予适应性解决方案。

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Two of the studies pointed to a genetic variation in the gene that is found commonly, and a third found a rare mutation of this same gene.

其中两项研究指出了该基因上的一种常见遗传变异，而第三项研究发现了该基因的一种罕见变异。

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Besides the tendency variation in each point, the strain mutation appears except the sample of soft inclusion, based on which the concept of strain nucleation is put forward.

除软包体型试样外，各点应变除趋势性变化外，都出现应变突变。据此提出应变成核概念。

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