对重载列车E级钢钩舌进行了应力分析，导出了钩腕面裂纹的应力强度因子表达式。

The stress of E-grade steel coupler knuckle was analyzed and the expression of stress intensity factor of the cracks on the coupler knuckle wrist area was given.

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我划了一根火柴发现我的腕表钩着了一块补丁。

I scratched a match and saw my watch catching a patch.

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