We have a number of fossil soils preserved that suggest there were periods of extreme aridity, perhaps extensive drought.

我们有一些保存下来的土壤化石，表明这里有些时候极度燥，可能彻底。

Continued gradual global warming has produced an increase in aridity for some areas over the past few thousand years.

过去的几千年里, 持续渐进的全球变暖导致一些地区的程度增加。

Pressure from humans may have played a role, along with the continuing trend towards increased aridity and the shrinking of forest habitats.

来自人类的压力，以及加剧和林栖息地萎缩的持续趋势， 可能发挥了一定作用。

Partly because of the dominance of the letter 'I' and the aridity, which, like the giant beech tree, it casts within its shade.

部分是因为字母“I” 的主导地位和，就像巨大的山毛榉树一， 的阴影下投射。

We know that this aridity may have caused animals to locate themselves more closely along the rivers and along the belts of vegetation that surround the rivers.

这种地区的贫瘠可能会导致动物们把们自己更近地沿着河流和河流周围的植被带安置。

Encountering for the first time in the history of the Anglo-Saxon race the problem of aridity, the Mormons surmounted the most perplexing obstacles with astounding skill.

面对盎格鲁-撒克逊种族历史上的第一次问题，摩门教徒以惊人的技巧克服了最令人费解的障碍。

We now journey out of this zone, heading towards the poles, but first  we must pass through the barrier of remarkably aridity, the zone of the hot deserts.

我们现要离开这个区域， 前往两极，但首先我们必须穿过极度的障碍，即炎热沙漠区域。