求翻译：摘要:北京流动人口从1978年的21.8万到2010年第六次全国人口普查时的704.7万，虽然年均增长看似只有21万人，但从1978年至1995年，年均增长仅有2万人左右，而1995年到2010年，流动人口年均增长均在50万人，1995年以后人口流入速度存在明显的加速趋势。这种加速趋势用传统的劳动力供求规律难以解释，因此，基于流动人口的地缘、劳动者自身特征、经济、心理和社会关系等微观因素构建外来人口向北京流动的动力模型，能够较好的解释外来人口向北京流动的行为及加速趋势。是什么意思？

Abstract: The floating population in Beijing sixth national census to 7.047 million from 21.8 million in 1978 to 2010, although the average annual growth rate appears to only 21 million people, but from 1978 to 1995, average annual growth of only 2 million, from 1995 to 2010, average annual floating

Summary: Beijing mobile population from 1978 to 218,000 in 2010, when 6 of the national census 7.047 million years, while only 210,000 seems to be growing, but from 1978 to 1995, average annual growth has only 20,000 people left and right, and in 1995 to 2010, population growth, per capita in 1995,