时差N小时 咖啡渍的奥秘(下)

（单词翻译）

Why is that? It’s because the edges of the spill are where the fluid is at its thinnest. A spill sitting on a flat surface is something like a pancake. Big in the middle and thin on the rim¹. As the thin edges evaporate, they are replenished² by liquid and particles of coffee from the denser³ interior. That starts an outward push going in the puddle⁴. The more it dries, the more particles get drawn⁵ out to the edges. When all of the liquid has evaporated we’re left with a ring of coffee particles making a stain.

这是为什么？这是因为泄漏的边缘流体在其最薄。泄漏坐在平坦的表面上是像煎饼的东西。在中，大轮辋上薄。由于薄边蒸发，它们是补充液体和颗粒密集的室内咖啡。这开始向外推，在水坑。它干得更会抽出更多的粒子边缘。所有的液体蒸发时，我们剩下的咖啡污渍颗粒环。