万年

The accretion of these "planetesimals" is believed to take a few hundred thousand to about twenty million years, with the outermost taking the longest to form.

这些微行星体的增长会用到几百万年到2千万年的时间，而最外面的部分最晚形成。八、&两个关键&和第二减速点。

We circle the galactic center in a period of 225-250 million years, always keeping approximately the same distance. Concerning a pole shift, I also don't know what this means.

我们地球绕银河系中心一周要花费225-250百万年，并保持着同一个距离不变，关于极移，我也并不知道这意味着什么。

Through the thousand plus exhibits, visitors will have no difficulties in visualising our message and perspective - the intriguing relationship between human and nature. We will see how we human beings, with our wisdom and experiences accumulated over generations, can adapt to the harsh and unforgiving environment imposed by nature. Interestingly, this behavioural adaptation is nevertheless brought about by making use of what nature can offer us.

大自然有时并不容易亲近-冰天雪地的严寒，又或者是乾燥曝晒的酷热-这些都是人类要克服的困境；但大自然往往又是一个丰富多彩的宝库，人类只要肯动脑筋，就可以从这些珍贵的资源中取得生活所需，毕竟，我们的祖先靠著这些资源，已渡过了艰困的数百万年。

Groundbreaking research by two french geophysicists promises to shed some light on the mystery.using 80 metres of deep sea sediment core, they have obtained measurements lots of magneticfield intensity that span 11 polarity reversals and four million years.the analysis reveals that intensity appears to fluctuate with a clear, welldefined rhythm.although the strength of the magnetic field varies irregularly during the short term, there seems to be an inevitable longterm decline preceding each polarity reversal.when the poles flip―a process that takes several hundred thousand years―the magnetic field rapidly regains its strength and the cycle is repeated.

答案为d。这一题目是根据上下文判断词意的题。flip的意思是&快速翻转&，它所在的句子的意思是&当两极互换――这一过程需要上万年的时间――磁场会很快重新恢复它的强度，新的一轮循环又开始了。&因此在四个选项中： a.decline的意思是&拒绝；变小、变弱&，b.intensify的意思是&变得更强烈、加剧&，c.fluctuate的意思是&涨落、波动&；d.reverse的意思是&使反转、倒退、颠倒&，例如：writing is reversed in a mirror。写出来的字在镜子里是颠倒的。d的意思与flip最接近。

Todd entura of the Uniersity of Illinois-Chicago will describe what may be the earliest archaean fossil eidence yet discoered-rock samples that are 2.71 billion to 2.65 billion years old that were collected from a deep underground gold mine in Ontario, Canada.

Todd entura将描述迄今为止发现的最早的古化石证据――在加拿大安大略省某地下深层金矿中发现的距今约27亿1千万年到26亿5千万年岩石标本。entura于他的同事发现该岩石中含有一种类脂，或者说是一种含油化合物，这种类脂只存在于古细菌细胞膜中。

Be pointed to " 2 million yuan of room diving that buy 1.6 million yuan are the following " all ages spends a city, it is the 3 annulus austral Beijing famous grail.

被指&200万元买的房跳水到160万元以下&的万年花城，是北京南三环知名大盘。

Mu Us Desert existed as early as 0.5Ma B.P. and underwent at least fourteen times positive and negative changes driven by the climate change.

毛乌素沙漠至少在五十万年前就已经存在，受第四纪时期干湿、冷暖气候变化的影响，沙漠历经扩大与缩小，在过去的五十万年里，有十四次沙漠明显扩大的时期。

Carbon dating puts the Cube here around 10,000 BC.

碳-14年代测定预估能量体是在公元前一万年来到地球的

P in Shule River Alluvial Fan Oasis in Gansu subsidized by CNSF. Through field geological and environmental observations and sampling, quartz OSL dating, organic carbon ~(14)C dating, as well as analysis of TOC,grain size and Pollen assemblage of the samples from ten sediment profiles in front fine grain sediment zone of the Shule River Fan, the results obtained as follows:(1)The vegetation evolution history on Shule River Alluvial Fan and circumjacent since about 13 ka B.P. could be divided into 6 phases: about 12.1-13.1ka, a sparse coniferous and broadleaf trees - shrub grassland, cold and wet climate; 9.2-12.1ka, shrub grassland, temperature rising but precipitation and humidity getting down; 5.8-9.2ka, sparse forest with the most flourish shrub grassland under the optimal climate; 4.3-5.8ka, coniferous and broadleaf mixed forests -shrub grassland, temperature rising slightly and getting dry; 4.3-2.8ka, grass vegetation and climate became more dry; 2.8-2.3ka, coniferous forests -shrub grassland, precipitation and temperature getting down, but a higher relative humidity.

本文依托于&甘肃疏勒河冲积扇5万年来古天气环境与古水文演化&项目，以疏勒河冲积扇为研究对象，通过对疏勒河冲积扇扇缘细土带全新世古天气和古水文演变进行了20余个剖面的观测和取样、石英OSL和~(14)C测年、粒度组成和TOC分析以及孢粉鉴定，获得了以下成果和熟悉：(1)距今约13ka年来冲积扇和周边植被演化经历了6个阶段：约13.1～12.1ka，以针叶林为主的针阔混交林～灌丛草原，天气冷湿；12.1～9.2ka，灌丛草原，气温升高，降水量较低；9.2～5.8ka，疏林灌木草原，植被茂盛，温度和降水最佳；5.8～4.3ka，以针叶树为主的针阔混交林～灌丛草原，气温较高，降水减少；4.3～2.8ka，草原植被，天气变干；2.8～2.3ka，针叶林～灌木草原，降水减少，温度降低，相对湿度有所增加。

The mountains about 578 meters above sea level, manganese steel by the formation of red and black from the gray of rock overlap, in which a mixture of black sandstone mountains, more than 2000 years by erosion and the formation of conical spire, a red, black and white rocks.

那山脉的海拔约578米，由红色的钢锰地层以及黑灰色的岩层交叠而成，其中黑色的山脉夹杂着砂岩，经2000多万年侵蚀而形成圆锥尖顶、红黑相间的岩石群。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。