另一方面，西非内陆的降雨量增加，采采蝇活动区域的北部边界向南移动——一种对牛致命的昆虫。
On the other hand, rainfall increased in the interior of western Africa, and the northern limit of the tsetse fly, an insect fatal to cattle, moved south.
因为该地录得的雨量来自各区域的单独测量数据，而卫星记录的雨量数据来自整个区域。
Rainfall gauges measure rain at a single location on the ground, while satellites record rainfall totals across a broader region.
这个区域的平均年降雨量为149至216毫米（小于1英寸），湖泊所在的盆地多数时候干涸为盐田。
This area receives 149 to 216 millimeters of rainfall a year on average, and the basins pass most of their time as saltpans.
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