此公式称为S2上的克罗夫顿（Crofton）公式。这一公式揭示了S2上一曲线的长度可通过一切与该曲线相交的大圆的交点数来计算。
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Crofton weed 紫茎泽兰
Ian Crofton 伊恩
Crofton House School 克柔佛顿中学 ; 克柔芙顿中学
John Crofton 克罗夫顿
Crofton House 克罗夫顿学校
Crofton Guest House 克罗夫顿宾馆
Crofton Hotel 克罗夫顿酒店
CACRO CROFTON 克罗夫顿
Crofton formula Crofton公式
·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
In treatment B, the leaf number, height, biomass, and the number of Crofton weed seedlings were much lower that those in control.
而提前播种苇状羊茅样地紫茎泽兰幼苗数量、生物量和分蘖数均显著低于对照，而株高与对照无显著性差异；
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There has been anger over plans to close Blackheath, Crofton Park, Grove Park, New Cross and Sydenham libraries.
BBC: Economic slowdown: Six London councils making cuts
Over 90 boats have been stranded between Crofton Lock near Wilton and Copse Lock near Hamstead Marshall since mid-November.
BBC: Trapped boaters on Wiltshire canal to be freed in new year
No one denies that the snakehead has flourished in the little Crofton pond.
CNN: Fish tale
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