Saharan Climatic Zone(西非，西非萨赫勒和苏丹带按气候分六带，其中最北的一带为撒哈拉气候带，地处撒哈拉南缘干旱地区。年雨量100〜200mm。 面积296万km²、约占西非萨赫勒带和撒哈拉带总面积的56%。人口 80万，人口密度约0.3人/km²。这里人烟稀少，雨季有南来的畜群短期放牧，荒漠化现象轻微甚至不显著，所谓撒哈拉南移，证据不足)
climatic zone A belt of the earth's surface within which the climate is generally homogeneous in some respect; an elemental region of a simple climatic classification(在地球表面的一个带状区域内气候在某些方面具有相同特征；一个简单的气候分类的基本区域。)
temperate climate The climate of the middle latitudes; the climate between the extremes of tropical climate and polar climate(中纬度地区的气候;热带气候和极地气候之间的气候。)
tropical climate A climate which is typical of equatorial and tropical regions, that is, one with continually high temperatures and with considerable precipitation, at least during part of the year(赤道和热带地区的一种典型气候，也就是说，至少在一年的部分时间里，会持续高温和大量降水。)
