The rough gear milling is the preceding working procedure of finish gear milling, which influences not only the machining efficiency of gear but also the final machining accuracy of tooth flank.

粗铣齿是精加工铣齿的前道工序，它影响齿轮的加工效率也影响齿面的最终加工精度。

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Liverpool started well and took the lead after 21 minutes, Bellamy working an opportunity on the left flank and providing the cross for Fowler to bundle home from close range.

BBC: Galatasaray 3-2 Liverpool

On his left flank stand America's white working-class voters, who face stagnant wages at best and protracted unemployment at worst.

ECONOMIST: The Republicans