如果有两个飞行昆虫种群居住在相距不远的不同山谷中，那么任一种群中的个体都有可能来回飞行，从而使基因流动继续。

If two flying insect populations took up residence in separate nearby valleys, chances are that individuals from each population would fly back and forth, continuing gene flow.

youdao

基因流动是相对自由的，因为个体可以移动，然后在新的地方与个体交配。

Gene flow is relatively free because individuals can move and then mate with individuals in their new location.

youdao

基因流动，即等位基因在整个物种范围内的移动，是相对自由的，因为个体可以移动，然后在新的地点与个体交配。

Gene flow, the movement of alleles across the range of the species, is relatively free because individuals can move and then mate with individuals in their new location.

youdao