Cracks leading to spalling were initiated at surface defects and boundaries between nitriding layes and the core.

导致剥落的疲劳裂纹开始于表面缺陷和氮化层与心部交界处。

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Brigit Layes of the Association of the German Petroleum Industry blamed intense price pressure on international markets and the strong US dollar for the "price adjustment".

BBC: Holiday fuel rise fury