SSS 2008-02-06
时间：2019-01-08 作者：英语课 分类：Scientific American(二)月
This is Scientific Americans' 60-second Science. I'm Karen Hopkin. This will just take a minute.
When you have an itch 1 nothing feels better than a good scratch. Now scientists from Wake Forest University Baptist Medical Center think they know why. The scientists were wondering why raking fingernails across skin brings us such pleasure. So they looked to the brain. More precisely 2 they looked in the brain. Using advanced imaging techniques the scientists looked to see which parts of the brain are most active when people scratch or in this case, when people are scratched by a guy in a white lab coat with a special scratching brush. What they found is scratching does not activate 3 areas of the brain normally associated with pleasure, although it did boost the activity of the prefrontal cortex which can be involved in compulsive behavior. That makes sense. But the major effect of scratching was to decrease the activity of brain regions associated with unpleasant sensory 4 experiences. So scratching seems to relieve the unpleasant feelings that accompany, well, itching 5. Yes in a landmark 6 study that appears in the Journal of Investigative Dermatology scratching gets rid of the itch. Me I'm holding out for the study that shows that people bang their heads against the wall because it feels so good when you stop.
- It's precisely that sort of slick sales-talk that I mistrust.我不相信的正是那种油腔滑调的推销宣传。
- The man adjusted very precisely.那个人调得很准。
- We must activate the youth to study.我们要激励青年去学习。
- These push buttons can activate the elevator.这些按钮能启动电梯。
- Human powers of sensory discrimination are limited.人类感官分辨能力有限。
- The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。
- The itching was almost more than he could stand. 他痒得几乎忍不住了。 来自《现代汉英综合大词典》
- My nose is itching. 我的鼻子发痒。 来自《简明英汉词典》