When the blade shroud under the status of self locking, the maximum centrifugal stress of the concave will occurred on the section of outer lace hole and nearby the leading edge.
围带自锁状态下内弧表面的最大离心应力发生在外拉筋孔截面的拉筋孔靠进汽侧处；
At step 6, withdraw the finger, feeding the left lace into the hole where the finger was.
在第6步，撤回手指，喂食左方花边成洞的手指了。
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