| 单词 | demographic transition |
| 释义 | demographic transition The process by which countries pass from a situation of high birth and death rates to one of low rates. less developed country (LDCs) typically have high birth and death rates: as development starts, death rates tend to fall earlier than birth rates, resulting in rapid population increase of up to 3 per cent per annum. More education and higher living standards reduce the birth rate, and advanced countries tend to have low birth and death rates and a low or even negative rate of natural increase. A similar process is observed in many immigrant groups; on movement to more developed countries, their death rate falls fast and their birth rate falls towards the host country level more gradually. |
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