【英语时差8，16】痒痒
时间：2019-02-23 作者：英语课 分类：英语时差8，16
英语课
When you have an itch 1, you scratch it. What could be more simple than that? Scratching itches 2 is one of our most basic instincts, one which we share with many other animals. Have you ever stopped to wonder, mid-scratch, exactly why scratching is so effective against itching 3? We'll learn the itchy truth, on today's Moment of Science.
On the most basic level, scratching is a way to remove whatever irritant might be causing the itch in the first place. If an insect is biting you, or you have a patch of dead, flaking 4 skin, scratching has a good chance of getting rid of it. In this case, it's pretty obvious why the scratching works.
Much of the time we scratch, however, it seems to be somewhat after the fact. Perhaps the mosquito has already bitten us and flown away, and we are left scratching at the swelling 5 bite. Clearly this won't get rid of the mosquito. Is there any good reason for this kind of scratching, or is this just an over-zealous instinct that doesn't realize it's too late?
Actually, this kind of scratching can serve two additional functions. First, it can stimulate 6 the irritated tissues and cause extra blood to flow to them. This can help your immune system remove whatever itchy substances might be below your skin. Second, it can trick your brain into ignoring the annoying itch. Your nervous system can generally process only one stimulus 7 from a given area of your skin at a time. If you scratch at an area that itches, this new, greater stimulus can override 8 the itching, effectively blocking it out.
n.痒( itch的名词复数 )；渴望，热望v.发痒( itch的第三人称单数 )
- His wool shirt always itches him. 他的羊毛内衣总是使他发痒。 来自《现代汉英综合大词典》
- This wool shirt itches my back. 这件羊毛衫使我背上发痒。 来自《现代英汉综合大词典》
adj.贪得的，痒的，渴望的v.发痒( itch的现在分词 )
- 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》
刨成片，压成片； 盘网
- He received ointment for his flaking skin. 医生给他开了治疗脱皮的软膏。
- The paint was flaking off the walls. 油漆从墙上剥落下来。
n.肿胀
- Use ice to reduce the swelling. 用冰敷消肿。
- There is a marked swelling of the lymph nodes. 淋巴结处有明显的肿块。
vt.刺激，使兴奋；激励，使…振奋
- Your encouragement will stimulate me to further efforts.你的鼓励会激发我进一步努力。
- Success will stimulate the people for fresh efforts.成功能鼓舞人们去作新的努力。
n.刺激，刺激物，促进因素，引起兴奋的事物
- Regard each failure as a stimulus to further efforts.把每次失利看成对进一步努力的激励。
- Light is a stimulus to growth in plants.光是促进植物生长的一个因素。