| 1. | Demographers are perhaps best known for making population projections .
人口学家或许在人口预测上最为知名。 |
| 2. | In the public ' s eyes , demographers have a checkered reputation
民众对人口统计学者的评价不一。 |
| 3. | Professor antonio golini is a demographer at the university of rome
罗马大学安东尼奥教授是位人口统计学家。 |
| 4. | Demographers say a rate of 2 . 1 is needed to keep a population from declining
人口统计学家指出，生育率必须达到2 . 1 ，才能防止人口减少。 |
| 5. | Arab - americans make up 3 million of the population in the united states , according to demographers
人口统计学家称，目前阿拉伯裔美国人共有三百万。 |
| 6. | Selectivity of human migration has long been the focus of demographers and economists
摘要人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点。 |
| 7. | Demographers have calculated that the world ' s population will double by the end of the twentieth century
人口统计学家推算到了二十世纪末世界人口会加倍。 |
| 8. | Millions of soon - to - retire baby boomers , say demographers , will propel this trend for years to come
人口统计学家称，成百万行将退休的战后一代将此趋势烧得更旺。 |
| 9. | Demographers also expect strains on the household registration system , which restricts internal migration
人口统计学家同时预测阻碍国内移民的户籍制度将受到压力。 |
| 10. | Demographer william frey says immigrants with young families will help keep the united states competitive
人口统计学家佛瑞表示这些年轻的家庭会帮助美国保持竞争力。 |
