So it is very important to find out the variation regulation of wood ring density in growth process.

解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。

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The feed regulation in ring rolling is researched on the basis of production of driven bevel gear blank in back bridge of EQ140 automobile in this paper.

本文结合EQ140汽车后桥从动伞齿轮辗扩实践，对环形件辗扩工艺的进给规范进行了研究。

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But the same package of tax and regulation cuts, if pitched to small-business owners and workers, has a nice populist ring of its own.

FORBES: All The Presidential Contenders Are Blowing It