Dr Martha Linet, the head of radiation epidemiology at the us National Cancer Institute, has looked at the same research as Carpenter but has reached a different conclusion.

美国国立癌症研究所的辐射列病学主任Martha Linet博士也曾做过与Carpenter教授一样的研究，但得出的结论却不同。

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A skillful carpenter, on the other hand, will drive the nail with a few firm, deft blows, hitting it each time squarely on the head.

而一个娴熟的木匠，只需坚实巧妙地正对钉头敲几下，就能一钉到底。

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Gary Hart rose superbly to head Richard Carpenter's curling free-kick goalbound, but Kelvin Davis pulled off an excellent reflex save only to see Virgo find the target with the rebound.

BBC: 1st leg: 14 May (1215 BST)

Part of the reason for 6to4's high profile is that its authors are two IETF heavyweights: Brian Carpenter, head of the Internet Architecture Board, and Applications Area Director Keith Moore.

CNN: New protocol sneaks IPv6 traffic over the 'Net