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赣州去眼角

2019年02月18日 16:40:47    日报  参与评论()人

于都县人民医院祛疤手术多少钱赣州打玻尿酸隆鼻去哪A sailboat is powered by wind, a motorboat by gasoline, and a rowboat by whatever the rower had for breakfast. Theres one water craft, however, that gets all its horizontal push from the downward pull of gravity alone. Is this some futuristic new type of boat? Not at all. Its the humble surfboard, and well learn about the physics of surfing on todays Moment of Science.帆船靠风行驶,托车靠汽油发动,而划艇的动力则来自于浆手的早餐。然而有一种水上运动完全依靠向下的重力获得水平方向的推力。这是具有前瞻性的新型船只吗?不,根本不是。那就是不起眼的冲浪板,在今日科学时刻,我们将要学习物理冲浪。Surfing is a lot like riding a skateboard down a hill—with the added advantage that the hill is moving along with you! When a skateboarder rolls down a hill, shes letting gravity pull her downward. She gets all her horizontal motion as part of this gravitational bargain. Once she reaches the bottom of the hill, she cant coast anymore unless she climbs the hill again.冲浪与乘滑板从山上冲下非常相似,只不过多了一项有利条件——“山”会跟随你一块前行!当一个滑板运动员滑向山下时,重力将她往下推。她的水平方向的运动也部分来自于重力作用。一旦到达山底,她就不能继续滑行了,除非她再次爬上山。Surfers dont need to climb their watery hills. They simply wait on their boards for a wave to rise up beneath them. When they get near the top, they stand on their surfboard, then let gravity start pulling them down the watery hill of the wave.冲浪者不必爬上浪形成的山。它们只需在冲浪板上等待浪花从底下翻涌上去便可。当他们接近顶部时,就站在冲浪板上任重力将他们推到浪花形成的水山下。The key to successful surfing is to slide downhill at exactly the same speed the wave moves up beneath you. If you slide down too fast, youll reach the bottom of the wave quickly and your ride will be over. If you slide down too slowly, the wave will outrun you.成功的关键在于,冲浪的速率要与浪花在你身下翻涌的速度一致。如果你滑行的速度过快,很快你就会到达浪底,行程自然就结束了。如果你滑的太慢,浪花就会将你淹没。Imagine our skateboarder again, but instead of a regular hill theres a monstrous hundred-foot-tall mole pushing up the ground beneath her wheels. If she rolls downhill at the same rate the mole is pushing the dirt up, shell stay at the same height above the ground--and be coasting downhill the whole time!再次设想一下,将正常的山换成一只巨大的,有几百英尺高的鼹鼠,它从地底破土而出。而滑板运动员刚好站在鼹鼠之上,她以鼹鼠推开泥土的速度滑向山下,一直保持在地面之上同样的高度,并且自始至终一直滑行!原文译文属!201208/197365赣州俪人男科医院做抽脂手术多少钱 At first glance, this old bush looks much like many other plants in the area, but researchers say this shrub known as Palmers Oak is considerably more special, because they believe it to be 13,000 years old, one of the oldest plants in the country. And its literally right across the street from Jurupa Hills residence Samuel Cano.第一眼看上去,这些灌木和这片地区的其他植物无甚区别,但研究人员说这种叫做Palmers Oak的灌木其实十分特别,因为它们是这个国家最古老的植物,已经活了一万三千年。生长面积从Jurupa Hills蔓延至Samuel Canon。13,000 years old,I mean thats a long time. A lot of history.Wow! And this literally could predate man in North America if my guesses are right. Scientist Andrew Sanders says what he found odd about this particular plant is that its typically found high in the mountains, not down here.So it got him and others thinking what if this oak bush sprouted during a much colder era. So they dated the plant and sure enough it probably was around during the ice age.一万三千年,真是很长的一段时间。有很长的历史。哇!如果我的猜测正确,这种植物比北美洲早期人类出现得还要早。科学家Andrew Sanders说,这种植物的奇怪之处在于,海拔越高,它就长得越高,海拔低就不会长得高。因此,Andrew和其他人都认为这种橡木灌木曾生活在较冷的区域。研究人员通过数据进行研究推测这些植物产生于冰河时代。The main thing that strikes me is that weve got where literally looking at a bit of what the world was like in the Ice Age. I mean we dont have to look at a fossil in this case. We can see the living individuals. So as far as researchers can tell this exact plant was growing here at the same time mastodons and sabre tooth tigers were roaming the area. The big question: how did it survive all these years.最震撼我的是,我们能够在理论上知道冰河时代地球上的情形。我是说,我们不用化石印,而是能看到现存的植物个体。研究人员惊讶于这种植物是如何在乳齿象和剑齿虎四处游荡的环境下生存的。I think the main thing is that its manage to get into this narrow rocky crevasse on a north facing slope. So its start to shade it. Scientists believe the shrub to be at least 1,000 years older than this creosote bushes in Palm Springs. So while that they may not look like much, this 75-foot-long old bush is in fact the oldest known living plant in the state,right here in Jurupa Hills.我认为主要是因为这种植物生长在狭窄的岩石裂缝中,面向北的斜坡上,始终不见阳光。科学家认为这种灌木比棕榈泉的石炭酸灌木至少早出现1千年。尽管它们长得一点也不像。这种高75英尺生长在Jurupa Hills的古老灌木实际上是加利福尼亚州最古老的现存植物。This is Rob for A News美国广播公司(A)报道。注:本篇文章英文来自普特论坛,译文属原创,,。201205/181900赣州俪人医院好不好

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赣州整形美容医院激光去红血丝多少钱 Mind Reading读心术Sometimes we get letters here asking whether psychics are for real. Well, despite the t.v. shows, there isn’t any scientific evidence that psychic powers, such as mind-ing, actually exist. That doesn’t prove they don’t exist–just that, so far, there’s no reason to think they do.我们有时会收到观众来信询问通灵人是否真实存在。实际上,除了电视节目,没有任何科学依据明特异功能的存在,例如读心术。但这也不能明它们不存在。只是目前为止,我们没有理由相信它们存在。Still, the famous scientist and popular writer Isaac Asimov made an interesting observation about mind-ing once. Many people across the centuries have claimed they could other people’s minds. If this is true, Asimov points out, then mind-ing would be a fact of nature. It would at least in some people be one of things that the human brain can do, just like dreaming or maintaining your body temperature. That would mean that mind-ing would have to be the result of evolution.不过,著名科学家及作家艾萨克?阿西莫夫做过一次有趣的观察,是关于读心术的。在过去的几个世纪里,很多人声称自己会读心术。如果真的是那样,艾萨克?阿西莫夫指出,那么读心术便是一种本性。人的大脑是可以做到的,就像做梦或者维持体温。这意味着读心术是进化的结果。If, somehow, brains could other brains directly, there would indeed be a very strong evolutionary advantage to it. In Asimov’s example, even a simple version of mind-ing, such as a chicken being able to sense an approaching fox’s brain as it thinks “food, food, food,” would be a huge advantage! Animals of any species that could do rudimentary mind-ing should survive much better than ones that couldn’t, and should pass on their mind-ing gene quite effectively.如果大脑能够直接解读其他大脑,必然会有一个强大的进化优势。在阿西莫夫的实例中,即使是读心术的简单版本,例如鸡能感觉到正在靠近的狐狸的大脑在想“食物,食物,食物”,这就是一个很大的优势。那些可以做最基本的读心术的动物比不会读心术的动物生存得更好,并且会高效地传授它们的读心术基因。Do you see the problem? The fact that there is a debate at all over whether mind-ing exists suggests that it doesn’t. If it were a real phenomenon, versions of it should be widesp, the way normal vision is. We would expect it to be everywhere . . . not just in a few “special” people with nothing up their sleeves.明白了吗?关于读心术是否存在的争论表明它根本不存在。如果读心术真实存在的话,它的版本应该更广泛,方式更正常。我们希望它无处不在,而不只是发生在几个毫无根据的;特殊;的人身上。 /201303/229877赣州俪人整形医院去痔赣州润白颜注射瘦小腿

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