冰河学家对木卫二进行了多年的研究，试图搞清为什么它的表面伤痕累累，裂纹丛生。
Glaciologists have been studying the surface of Europa for many years, trying to work out what formed its scarred, fractured surface.
采用扫描电镜进行断口分析，结果表明，零件内弯处外表面上的冲压伤痕是导致其早期疲劳断裂的主要原因。
The fracture surface was inspected by SEM. The results showed that the stamping damage on the surface around the inside bend was the main factor to cause the early fracture.
验尸官表示，尸体表面没有任何外伤痕迹。
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