Low average population densities are characteristics of most underdeveloped countries.
平均人口密度低是大多数不发达国家的特点。
2
The population and community characteristics in the Platycladus orientalis forest on Qianfo Mountain in Jinan are studied.
研究了济南千佛山侧柏林的种群和群落特征。
3
Rather, the rural population contains a higher proportion of persons whose characteristics, such as poor health, place them at high risk for depression.