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福州精液项目检查哪家医院好网上分类博爱医院检查输卵管好不好

2019年08月19日 15:16:59    日报  参与评论()人

福州治疗多囊卵巢综合症那家医院好福州治疗多囊卵巢那里比较好In his book Cosmos, the late scientist Carl Sagan talks aboutthe way in which the earth is regularly struck by material fromouter space.已故科学家卡尔·萨根在著作《宇宙》中叙述了外太空物体如何有规律和地球发生碰撞。These collisions with space debris can beminor–as in a shooting star on a summer night–or amazinglydestructive, as in the collision that probably killed off thedinosaurs.太空垃圾和地球碰撞的机率很小,就像夏夜划过流星,破坏性却很大,这种碰撞可以令恐龙灭绝。Thankfully, the biggies are extremely rare.值得庆幸的是,这种机率太渺茫了。Sagan makes the point that the most dangerous collision facing us now, however, is one thatmight be mistaken for something else:a nuclear attack. 萨根阐述的观点是目前我们面临的最危险的是碰撞而非人们误解的核战。He warned that thinking an asteroid isactually an ICBM could result in the worst possible destruction–an unintended war.他提醒人们,事实上,行星就像洲际弹道导弹,可能产生意料外破坏性极大的战争后果。Was this just paranoid thinking? Unfortunately, no.这仅仅是偏执思维吗?不幸地是,无独有偶。Carl Sagan is no longer with us, but intestimony before congress just last year, a ed States Air Force brigadier general warned thatjust such a thing almost happened in June of two thousand and two.去年,一位美过空军准将在国会的一份词中称类似的事情发生在2002年6月。That’s when a meteoroid entered the earth’s atmosphere over the Mediterranean and was picked up by U.S. early-warning satellites on the lookout for high-altitude explosions and incoming missiles.美国预警卫星在监测高空爆炸物和来袭导弹时发现一颗流星穿破地球大气层,降落在地中海地区。The alarming object falling from the sky was recognized for what it was, this time.而这次人们确认从天而降令人惶恐的物体究竟是什么。The generals’point, though, was that we never know where space junk will fall.准将指出我们无法确定太空垃圾降落在什么地方。Turn the globe by just a fewhours earlier on that day in June and the meteoroid would have been over the border of Pakistanand India–exactly where everyone was fearing a nuclear attack.如果六月的这天,地球转动退回到几小时前,流星降落的地方就正好是巴基斯坦和印度的交界处,世人唯恐发生核战的交界地。We’ve been lucky so far.迄今为止,我们都还很幸运。But Carl Sagan’s warning came perilously close to becoming a prophecy and a harmless natural event in the sky, to triggering a terrible event here on earth.但是,卡尔·萨根的提醒很可能是可怕的预言,本来平常的天空自然事件很可能引发地球灾难。 201409/329471福州什么医院精液常规检查比较好 Sit on a swing, let someone push you, and away you go.坐上秋千,身后一人使劲一推,你便飞了出去,翱翔半空。But what happens if the person who pushed you walks away, and you want to swing faster and higher.但要是再身后推你的人走开了,而你仍想秋千荡得更高更快,那该如何?If youve ever been in the second grade, you know the solution to that.这个问题,只要你上了二年级,就知道该怎么做。Just startpumping your legs-stretching them forward then drawing them up underneath you-and youcan make yourself swing higher.首先用以摇晃双腿,再向前伸展开来,最后将腿滑向身体之下,秋千就能荡得更高。Have you ever wondered why this is?但你是否想过这是什么原理?Swings work by converting potential energy into kinetic energy, then kinetic energy back intopotential energy, over and over again.秋千的工作原理是将势能转化为动能,然后又将动能再转化为势能,一遍遍的重复这个过程。The kinetic energy is the fast part of swinging; its the speed you have as you rush back and forth.动能是秋千快的一部分能量,表现为来回运动时的速度。Potential energy is the high part of swinging.势能存在于秋千荡的的高度之中。The higher you go on the swing, the more potential energy you have.秋千荡得越高,所获得的势能也就越大。Even though youre not moving at the very top of each swing, you can think of your height asyour potential for speed.即使在秋千的顶点你并没有运动,但你仍然可以将你的高度认为是潜在的速度。A physicist would say that your kinetic energy-that is, your speed-is“stored” as potential energy at the top of each swing.物理学家会告诉你,动能,也就是速度,储存在每次摆动顶端的势能里。More height is more speed, just waiting to happen.这就意味着,荡得越高,速度也就越快。You can increase the energy of your swing in two separate ways.以下两种方式都可以增加摇摆的能量。If someone pushes you, that increases your kinetic energy.要是有人在身后推你,那将增加动能。By pumping your legs, you can increase your potential energy.摇晃双腿的方式,增加的是势能。By raising your legs at the top ofeach swing, you can raise the overall center of mass of your body, effectively raising the height ofyour swing.当双腿达到每次摇摆的顶部,身体重心也提高,这就有效的提升了秋千高度。Pump after pump, the energy you burn in your legs increases your swings potential energy.不断的摇晃,双腿产生的能量将增加势能。That extra height will add up, giving you a wilder swing ride.由此,秋千会荡得更高,更精。 201407/311127At last, this compromised, sycophantic, creepily self-exonerating historian stands tall, brimful with pride in his Judaism, and says in a phrase I find genuinely moving—We have become the teachers of men in the greatest of things.最后,这一妥协,奉承,令人毛骨悚然,兼具自我责备之心的历史学家最终赢得了胜利,他的犹太教满怀骄傲之情,而说着一句令我真正感动的话,我们成为了男性的榜样,做出了最伟大的事情。Given the hammer blows of the Roman legions, and coming as they did after century upon century of blows from Egyptians, the Syrians and Babylonians, there would have been scant reason to suppose that the Jews would survive as a people. And yet, 2,000 years later, the Jews are still here. How. Well, one answer can be found back at the Arch of Titus, not something thats here, but something thats not.对于罗马军团的打击,就如同他们几个世纪来对埃及人,叙利亚和巴比伦人所做的一模一样,这是我们认为犹太人生存下来的理由。然而,2000年后,犹太人仍在这里。在提图斯的拱门处可以找到,这里没有什么东西留下,但绝不是空无一物。When Josephus describes the procession of loot and prisoners parades through the streets of Rome, he says, and last of all of the spoils was carried, the laws of the Jews. But where are the laws. Where are the Torah scrolls. Conspicuously, tellingly, they are absent.当约瑟夫描述掠夺和囚犯游行的队伍走在罗马的大街上,他表示最后所有的战利品是犹太人的法律。但法律在哪里。律法的卷轴在哪里。明显的是它们已经不在了。What were scrolls of law anyway. Just so many words on parchment, not really worth the time of a sculptor or the cost of the marble. But words copied, memorized, internalized, made unforgettable, will beat swords any time. You cant hold words captive. The Roman Empire has come and gone, but go into a synagogue any Saturday, and youll still hear those words.什么是法律卷轴。只是羊皮纸上的很多单词,不是雕塑家倾注的大把时间或大理石的价值。仅仅是复制,记忆,难忘,会使得剑刃折断的话语。你不能囚禁语言的奴隶。罗马帝国来去匆匆,但只要在任何一个周六进入会堂,你仍然会听到这些话。201404/291908福州市人流费用都是

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