The helicoidal surfaces are produced mostly by form cutting with forming cutters of end mill type, side mill type or disc type.

螺旋面大多数是用球头铣刀、侧铣刀、盘形刀具成形加工出来的。

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Most Western countries ban it: in Britain, where around 66, 000 women have undergone some form of cutting and some 33, 000 girls are thought to be at risk, it is also a crime to take a British resident abroad in order to cut her.

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The latest facelift (unveiled last night with help from Grammy-award winning singer Alicia Keys) comes in the form of a cutting-edge LED lighting system, provided by Philips Color Kinetics (PCK).

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"We do not see this breach as a reflection on their playing form or a cost-cutting exercise, as has been suggested, " he said.

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