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、低倍检验、金相检验、力学试验和化学析等法，析了字齿生劈裂的原因。