自然灾害

It must have been this humanizing skill, and the intellectual growth related to it, that enabled one group of animals to gain an advantage in the race for surgical.

正是这些人类技巧和与之相关的智力增长使一群动物在进化过程中获益匪浅。

Volcanic rocks of Xishanbulake Formation and Shuiquan Formation are of alkali basalt series, those of Zhamoketi Formation are of alkali basalt series and tholeiite series, and those of Beiyixi Formation are obviously characterized by bimodal assemblage and mostly belong to alkali volcanic rocks.

其中，西山布拉克组和水泉组火山岩均碱性玄武岩系列；扎摩克提组火山岩分属碱性火山武岩系列和拉斑玄武岩系列；贝义西组火山岩具有明显的双峰式组合特徵，大部分属碱性火山岩。