不等概率抽样

【英音模仿秀】生活中的数学

模仿文本：So it seems not everyone is sure but do mathematicians agree of whether zero is odd or even? The debate is settled among mathematicians. Mathematicians are agreed that zero is an even number? Zero is an even number, and it will pass ev

发表于:2018-12-28 / 阅读(39) / 评论(0)

英音模仿秀

英闻天下——396 European Health Improvements Unequal

In its latest report issued every three years, the WHO Regional Office for Europe has found the average life expectancy at birth among the 900-million people in Europe is 76-years. This is 5 years longer than in 1980. More people are also living past

发表于:2019-01-19 / 阅读(51) / 评论(0)

英闻天下

2013年ESL之日常生活 20 Describing Chance and Probability

Describing Chance and Probability Raul: What are the chances that Rob will be here on time? Tiffany: Id say its fifty- fifty. You never know. He might surprise us and be early. Raul: Fat chance of that happening. Ive known him for three years and if

发表于:2019-01-23 / 阅读(126) / 评论(0)

2013年ESL之日常生活

英语角-圆桌会议 RoundTable1021 - 你懂得撒谎吗？

Topic 1-Campus Delivery Industry Development Report A recent report has revealed that Chinese university students spend on average 11 hundred Yuan on e-commerce. What's more, the better the university is, higher the spending. What does it say about o

发表于:2019-02-15 / 阅读(36) / 评论(0)

英语角-圆桌会议

男人每隔多久就会“性”趣盎然？

It's a stat that gets bounced around as e-mail-forward wisdom: men think about sex every seven seconds. Even when the idea lacks this mythical specificity and grandiosity (that's 7,200 times a day!), the idea that men think about sex basically all th

发表于:2019-02-17 / 阅读(48) / 评论(0)

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分类词汇：人口普查

natality 生育 fertility 生育率 fecundity 生育能力 birth rate, natality rate 出生率 births 出生人数 parity 胎次 premature birth 早产 life birth 活产 stillbirth 死产 birth peaks 出生高峰 mortality 死亡 mortality rate 死亡率

发表于:2019-02-18 / 阅读(58) / 评论(0)

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agricultural classification