没有世袭的抓痒官。
他为什么总是不停地抓痒？
科学家们已经明确找到将抓痒提醒信号传输到大脑的一组关键细胞。
Scientists have pinpointed a key group of cells that sends itch-alerts to the brain.
而且指甲在抓痒(大多数哺乳动物都很享受的过程)和梳理毛发时也很重要。
They're also important for scratching (a pleasurable experience most mammals enjoy) and grooming.
丹妮尔·亚历山大现年36岁、童年时期几乎每天都在抓痒中度过。
Danielle Alexzander, 36, spent nearly every day of her childhood scratching.
原来抓痒所得到的舒缓感是来自于一个特殊信号，它能安抚神经的反应。
It turns out that the relief from scratching comes from a special signal that quiets nerve reactions.
头脑里出现的想法就好像是被蚊虫叮了一样：您需要抓痒痒，这样做才感觉舒服一些。
An idea is like an itch: you need to scratch it, and when you do it feels better.
你真的可以游到翻车鱼身边，它们很温和，如果你靠近得当，你就能给它们抓抓痒，它们会很享受。
You truly can swim up to a Mola, they're very gentle, and if you approach them right, you can give them a scratch and they enjoy it.
它像是一个咬指甲，或是抓痒，拉头发的习惯，或是当一个人紧张时，不论可能做出什么的行为。
It is like a habit of biting the nails, perhaps, or scratching, pulling at the hair, or whatever one may do when one is nervous.
许多疾病会导致反复或持续性的发痒。因此罹患这些疾病的人会受到因过度抓痒而造成的严重伤害所苦。
Many diseases can lead to repeated or constant itching. Therefore, people with them can suffer from serious injuries which are caused by too much scratching.
海狸给了沃尔特一个新产品的创意，一种“抓痒 elmo”那样大小的，新的木雕工具套装，使沃尔特登上了杂志封面和电视节目。
The Beaver inspires a Tickle-Me-Elmo-size success with a new woodcutting kit for kids, catapulting Walter onto magazine covers and TV programs, where the Beaver continues to speak for him.
在一处偏远的海岛上，我们发现毛茸茸的海象们懒洋洋地躺在海滩上，它们似乎更乐意睡觉，或用脚蹼为自己抓痒，而无意集合起来向我们的橡皮艇发起攻击。
We find a furry mound of them lolling on a beach on a remote island, but they are more intent on sleeping and scratching themselves with their flippers than making a concerted assault on our zodiacs.
在一处偏远的海岛上，我们发现毛茸茸的海象们懒洋洋地躺在海滩上，它们似乎更乐意睡觉，或用脚蹼为自己抓痒，而无意集合起来向我们的橡皮艇发起攻击。
We find a furry mound of them lolling on a beach on a remote island, but they are more intent on sleeping and scratching themselves with their flippers than making a concerted assault on our zodiacs.
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