Cast steel pulley with wallunevenness, many hot pitch points and narrow feeding channel is difficult to be fed by setting up a head.
铸钢皮带轮，壁厚不匀，热节点多，补缩通道狭窄，很难用设置冒口的方法给予补缩。
2
An Angle of the wall being given, with the tension of his back and legs, with his elbows and his heels fitted into the unevenness of the stone, he raised himself as if by magic to the third story.
他在墙角里把肘弯和脚跟靠紧石块上的不平处，便能利用背部和腿弯的伸张力，妖魔似的升到四楼。
3
The dynamic buckling behavior of the thin-wall cylindrical shell is more complicated than that of the thick shell due to its more unevenness.