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Its whistle shrilling, the train was passing over an iron bridge. The door handle, the steel floor and their shoulders were bouncing with the motion of the train.

列车正轰鸣着开过一架铁桥，车门上的把手、铁踏板和乌蒙蒙的玻璃窗都在震响着，他们的肩头也在随着晃动着。

The result shows that the cruciform specimen with square thinning center region is the superior device for the investigation of forming limit stress diagram to obtain the more homogeneous stress distribution in the center region, to realize the large deformation and the fracture appears in the center region more easily, and to control the stress concentration preferably.

结果表明，中心区方形减薄的十字形试件有更好的中心区应力分布均匀性，更容易实现大变形以致破裂发生在中心区，能较好地控制应力集中，是更适用于板料成形极限应力图研究的实验装备。