It is likely that the genes involved, which include genes that encode neuronal ion channels, have been subject to a positive selection pressure leading to an accelerated evolution of genetic changes.

与之其进化相关的基因，包括编码的神经离子通道的基因，可能受到了积极的选择压力，从而加速了基因变化的转变。

youdao

Despite the fear of a decrease in travel, Abacus' air booking data showed that there are some green shoots in terms of a selection of positive market performances.

虽然人们对旅游衰退存在担忧，但Abacus的机票预订数据显示，一系列积极的市场表现方面存在新生希望。

youdao

In the first case, strong positive selection for the gene is dissipated by weak selection against hundreds of others.

前一种局面下，自然选择机制对好基因的积极选择，被其余几百个坏基因的逆选择白白浪费掉了。

youdao

In addition, little was known about the role that positive selection may have played in shaping the biology of human populations as they migrated and expanded.

FORBES: The Human Genome at Ten

Obviously there have been instances when a player has felt aggrieved and there were times in my career where I felt hard done by, but overall I believe the continuity of Australia's selection process has had a positive affect on the consistent performances of the team.

BBC: Justin Langer column

The impressive results may partly derive from positive selection.

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