坡度和高程是土地资源固有的二个重要环境因子，对土地利用和土地生产力有直接作用。
Nature slope and sea level elevation are two important intrinsic environmental factors of land resource which have some direct effects on the use and productive forces of land.
SST是海洋作用于大气的最直接的因子，是海洋-大气运动系统中的一个重要变量。
SST is the most direct factor in the course of ocean affecting atmosphere, and it's an important variable in the ocean-atmosphere system.
它是人类活动作用于自然环境的主要途径之一，是历史时期土地覆被变化最直接和主要的驱动因子。
It is one of the main methods by which the human activities have effect on the environment and the most direct and important factor that drives land cover to change in history.
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