实验结果表明，孔洞是由于超塑性拉伸变形中品界滑动不协调而引起的。
Experimental results indicate that cavities are formed during superplastic deformation due to the inconsistency of grain boundary sliding.
通过胯部的拉伸向后滑动右腿，保持膝盖不要动，让脚在地上水平滑过。同时向前摆动左臂。
Slide right leg backward by pulling from the hips, keeping that knee locked and that foot flat on the ground. Swing left arm forward at the same time.
通过胯部的拉伸向后滑动右腿，保持膝盖不要动，让脚在地上水平滑过。同时向前摆动左臂。
Slide right leg backward by pulling from the hips, keeping that knee locked and that foot flat on the ground. Swing left arm forward at the same time.
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