Although the likelihood of any neutral mutation spreading by chance is tiny, the enormous number of mutations in each generation makes genetic drift a significant force.

虽然任何中立变异随机传播的可能性很小，每一代个体产生的大量变异却使基因漂变具备显著的力量。

youdao

But malnutrition 'is a driving force in emerging infectious diseases that are spreading around the world, ' she says.

说，许多人或许认为地球另一边的人营养不良不关他们的事，但正是营养不良促使了在全球肆虐的新型传染疾病的出现。

youdao

And then there is the strange life force of the Delphos, the way its hem pools on the ground like the spreading roots of a tree, and how the vertical pleating begins to look like bark.

WSJ: The Rich Pleasures of Pleats | Fortuny | Spanish Institute | By Laura Jacobs

So they can't go out and force people to take measures, like having fire walls, cleared-away lanes to prevent fire from spreading.

NPR: In Portugal Another Season of Forest Fires