【英语时差8,16】洒出的咖啡
时间：2019-02-15 作者：英语课 分类：英语时差8，16
Next time you spill a little, let the coffee dry before wiping it up. You’ll notice that after it dries there is a darkish ring around the very edge of the spill, whereas the middle disappears almost entirely 1. What’s going on here? Robert Deegan and Sydney Nagel at the University of Chicago looked into this phenomenon, and they discovered something pretty interesting. The coffee puddle 2 leaves a ring because it doesn’t simply dry where it sits. As the spill begins to dry, it actually creates its own outward motion, drawing the insides of the puddle toward the edges. 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 rim 3. As the thin edges evaporate, they are replenished 4 by liquid and particles of coffee from the denser 5 interior. That starts an outward push going in the puddle. The more it dries, the more particles get drawn 6 out to the edges. When all of the liquid has evaporated we’re left with a ring of coffee particles making a stain.
- The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
- His life was entirely given up to the educational work. 他的一生统统献给了教育工作。
- The boy hopped the mud puddle and ran down the walk.这个男孩跳过泥坑，沿着人行道跑了。
- She tripped over and landed in a puddle.她绊了一下，跌在水坑里。
- The water was even with the rim of the basin.盆里的水与盆边平齐了。
- She looked at him over the rim of her glass.她的目光越过玻璃杯的边沿看着他。
- She replenished her wardrobe. 她添置了衣服。
- She has replenished a leather [fur] coat recently. 她最近添置了一件皮袄。
- The denser population necessitates closer consolidation both for internal and external action. 住得日益稠密的居民，对内和对外都不得不更紧密地团结起来。 来自英汉非文学 - 家庭、私有制和国家的起源
- As Tito entered the neighbourhood of San Martino, he found the throng rather denser. 蒂托走近圣马丁教堂附近一带时，发现人群相当密集。