稀稀落落的常住人口和休闲活动（尤其是滑雪）的发展，导致当地生态系统发生了重大的长期变化。

A thinly scattered permanent population and development of leisure activities, particularly skiing, have resulted in significant long-term changes to the local ecosystems.

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实际的强度水平取决于诸如大城市的物理布局、人口密度和生产活动之类的因素。

The actual level of intensity depends on such factors as the physical layout, population density, and productive activities of a metropolis.

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绝大多数人口仍然从事农业活动，城市居民也不例外。

The vast majority of its population remained active in agriculture, even those people living within the city itself.

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