I had to give my helpers clear instructions about what kind of sample population I wanted them to use.
我不得不清楚的告诉我的助手们,哪些抽样人口是我想让他们调查的。
单词 | Population I |
释义 |
Population I
原声例句
剑桥雅思听力全真试题 8 I had to give my helpers clear instructions about what kind of sample population I wanted them to use. 我不得不清楚的告诉我的助手们,哪些抽样人口是我想让他们调查的。 VOA常速英语_非洲 I think in the general communities with this large populations I don't know how they would be able to handle it. 在人口众多的贫困社区里,我不知道他们将如何处理这一问题。 第三季 Stressville. Population: me. Okay, big decision. 地点在压力之城 人口数 就我一个 好了 还有个重大决定。 VOA Special 2014年6月合集 However, China and India rate far below other large economies when their economies are compared with their populations. I'm Mario Ritter. 然而,如果将中国和印度的经济与人口进行比较,则中国和印度的排名远低于其他大型经济体。我是马里奥·里特。 可汗学院:统计学(视频版) The way I took the mean of a population, I said, well, if I just have a sample, let me just take the mean the same way. 我说,我采用人口平均值的方式,好吧,如果我只有一个样本, 让我以同样的方式取平均值。 2015 English Cafe Many people thought Prohibition was a good idea, that it was going to end problems with alcoholism and drinking, especially among America's immigrant population (I suppose in particular my ancestors, the Irish). 许多人认为禁酒令是个好主意,它将结束酗酒和饮酒问题, 尤其是在美国移民人口中(我想尤其是我的祖先, 爱尔兰人)。 PBS访谈健康系列 In your reporting, I saw they responded in various ways. Some are teaching hospitals. Some are working with, I guess, poorer populations, so there was that response at least to the numbers today. 在您的报告中,我看到他们以各种方式做出回应。有些是教学医院。我猜有些人正在与较贫穷的人群合作,所以至少对今天的数字有这样的反应。
中文百科
星族 Stellar population(重定向自Population I)
星族是银河系中年龄、化学物质组成、空间分布与运动特性较接近的恒星集合,于1927年由布鲁根克特(P. Bruggencate),1944年由美国天文学家沃尔特·巴德区分成现在的三族恒星。 观察银河系内的恒星,可以将她们分为第一星族和第二星族两大类(在理论上还有第三星族,但在银河系内未曾发现)。做为分类标准的是年龄、化学成分、在星系内的位置、和空间速度。 主要的原因是年龄,不同的星族在赫罗图上分布的位置不一样,这就像应用在星团时一样,在星团中,所有的成员被认为有着相同的来源。 通常,区分族群的数字(一、二、三)的增加并不意味着世代交替,只区分彼此间的年龄。
英语百科
Stellar population 星族(重定向自Population I)
![]() ![]() In 1944, Walter Baade categorized groups of stars within the Milky Way from their spectra. Two main divisions were defined as population I and II, with another division known as population III added in 1978. Later these differences were shown to be significant, dividing them by their chemical composition or metallicity, the proportion of stellar matter made up of the "heavier chemical elements", beyond hydrogen and helium. By coincidence, each population group definition has decreasing metal content and increasing age. Hence, the first stars in the universe (low metal content) were deemed population III, and recent stars (high metallicity) are population I. |
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