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哈尔滨无痛人流微创手术要多少钱69专家

2019年08月21日 18:23:45 | 作者:百科时讯 | 来源:新华社
Using tablet computers like Apple#39;s iPad and Samsung#39;s Galaxy Note just before bed can lead to a poor night#39;s sleep, according to research. More and more people are taking their tablets to bed with them to surf the web, check Facebook or email before switching off the light. But researchers are warning that the blueish light their screens emit can stop users getting a good night#39;s sleep. That is because this type of light mimics daylight, convincing the brain that it is still daytime.Blue light suppresses production of a brain chemical called melatonin, which helps us fall sleep. This is because our brains have evolved to be wakeful during daylight hours. By contrast, light which is more orange or red in tone does not suppress melatonin production, perhaps because our brains recognize it as a cue that the day is ending. Neurologists have known for years that staring at screens late in the evening can disrupt sleep - be they television screens, computer screens or mobile phone screens. However, because mobiles and tablets are by nature portable - not to say addictive - more people are taking them into the bedroom. Users also tend to hold them much closer to their eyes than a computer or television screen.Researchers at the Lighting Research Centre, at the Rensselaer Polytechnic Institute in New York, are warning that looking at tablet displays for more than two hours ;leads to a suppression of our natural melatonin levels as the devices emit optical radiation at short wavelengths; - in other words, they emit bluer light.很多人喜欢睡前躺在床上拿iPad或手机上网、看电影或者玩游戏。最近有研究显示,这种行为会影响睡眠质量。研究人员指出,iPad等设备的屏幕会发出蓝色的光,这种光与阳光类似,会抑制大脑分泌褪黑素,从而使其处于清醒状态,难以入睡。而长期睡眠不规律则可能增加肥胖和患乳腺癌的风险。对此,研究人员建议,睡前使用移动电子设备时可尽量将屏幕亮度调暗,并控制使用时间。另外,研究人员还建议平板电脑制造商调整自发光设备的频谱功率分布以减少其对用户睡眠状况的影响。 /201209/199427

While proudly showing off his new apartment to friends, a college student led the way into the den.一个学生带他朋友们参观他的新公寓,甚是得意。What is the big brass gong(锣) and hammer for? one of his friends asked. That is the talking clock, the man replied.那个大铜锣和锤子是干什么用的?他的一个朋友问他。那玩意儿厉害了,那是一个会说话的钟,学生回答。How#39;s it work?Watch, the man said and proceeded to give the gong an ear shattering pound with the hammer.这钟怎么工作的,他的朋友问。看着,别眨眼了,那学生走上前一把操起铜锣和锤子,拼命地敲了一下,声音震耳欲聋。Suddenly, someone screamed from the other side of the wall, Knock it off, you idiot! It#39;s two o#39;clock in the morning!突然,他们听到隔壁墙那边有人狂叫,别敲了,你这白痴!现在是凌晨两点钟了! /201304/235969

天枰座——The Count of Monte Cristo《基督山伯爵》这部书主要描写的是人性黑暗的一面,而天平们通常对人性的黑暗不是很了解,这本书可以充分的了解一下世间的可怕。相同关键词:人性The Count of Monte Cristo is an adventure novel by Alexandre Dumas, père. The story takes place in France, Italy, islands in the Mediterranean and the Levant during the historical events of 1815–1838. The historical setting is a fundamental element of the book. It is primarily concerned with themes of hope, justice, vengeance, mercy, forgiveness and death, and is told in the style of an adventure story.《基督山伯爵》是法国著名通俗历史小说大仲马(1802-1870)的代表作。法老大副堂泰斯船长委托,为拿破仑党人送了一封信,遭到两个卑鄙小人和法官的陷害,被打死牢。狱友法里亚神甫向他传授各种知识,并在临终前把埋于基督山岛上的一批宝藏秘密告诉了他。堂泰斯越狱后找到了宝藏,成为巨富。从此名基督山伯爵,经过精心策划,报答了恩人,惩罚了仇人。本充满浪漫的传奇色,章章奇特新颖,引人入胜。 /201208/196780

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