英语语法分析

Spalling was a major form of contact fatigue failures in nitriding steel.

氮化钢的主要接触疲劳破坏形式是剥落。

Natural cracks and spalling of soft film smallpox is unlikely, almost impossible.

软膜天花自然产生裂缝和剥落可能性不大，几乎不可能。

The recent conditions of research on wheel spalling in North American Railway are reviewed.

回顾北美铁路研究车轮剥离的近况。