regulation of population density的意思|示意

At the other end of the list are cities in Canada and the United States, which benefit from lower population density, favorable climates and stricter air pollution regulation.

污染最轻的是美国和加拿大的城市，原因是它们的人口密度低，气候怡人，并且空气污染管理规定非常严格。

Regulation of self- thinning is that relationship between DBH and average density of population accords with negative power function.

樟子松种群自疏规律为：平均胸径与密度的关系符合负幂函数模型。

At the other end of the list are cities in Canada and the United States, which benefit from lower population density, favorable climates and stricter air pollution regulation.

在污染排行中最靠后的是加拿大和美国的城市，受益于较低的人口密度、优越的气候和较严格的空气污染法规。