The tree was struck by lightning and splintered.

那棵树被闪电劈裂了。

The failure of a gear shaft was analyzed by SEM analysis, macrograph, metallographical examination, mechanical test, chemical analysis and etc.

摘要采用扫描电镜、低倍检、金相检、试和化分析等方法，分析了字齿轮轴发生劈裂的原因。