Then, it discusses Centering Theory and its formalisms.
接着讨论“中心理论”的主要内容及其形式机制；
Working principles: Tool using a self-centering theory, generated through the mandrel roller adjustment hitting, rolling motion.
工作原理：工具采用自定心原理，通过芯轴调节滚柱产生击打、滚压运动。
In this paper based on the three points centering and four points centering theory, peeling log six points centering theory is pointed out.
本文在原木三、四点定心理论的基础上，提出了旋切原木六点定心理论。
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