中期以后直至成熟，皮层和髓细胞强烈扩大、径向伸长。
The expansion and radial spread of cortex and pith cells are very strong after the mid-dle stage.
系统地分析了刀具转速和悬伸长度对立铣刀径向位移、最大等效应力的影响规律。
At the same time, the influence laws of the rotational speed and suspended stretch of the tools on the radial displacement and the maximum equivalent stress have been investigated in detail.
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