行星迁移发生在行星与气体或星子的星盘之间进行潮汐相互作用时，这造成行星轨道参数，特别是半主轴的变更。
When the planetary migration occurs under the tidally interaction of a planet and a disk of gas or a planetesimal, the orbital parameters, especially, semi-major axis, of this planet will be altered.
半精加工的主轴承安装后需要修整和调配，这样曲轴就必须拆下。
Semifinished main bearings require finishing and fitting after installation, so that the crankshaft must be taken out.
通过对加工中心TKP6511主轴加工工艺过程的分析，改进了其半精加工及精加工的工艺设计。
Introduces the analysis on technological processes for the spindle of machining center TKP6511, improves the technological design of semi-finish machining and finish machining.
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