By 1970, physicists were searching for theoretical particles called quarks. These strange beasts4 had mass, but no radius: a quark is just a one-dimensional point, but a bundle of quarks somehow added up to a proton, the nucleus of the hydrogen atom. The question was: what forces held them together, inside a proton that was itself one 10,0000th the radius of an atom?
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If everything works, but you get no results, the search radius of twenty miles might be too small.
如果一切工作正常，但是您没有得到结果，那么可能是20英里的搜索半径太小。
It has no definite boundaries, but covers an area of about twenty miles radius from Oxford Circus.
它的边界并不明确，但它占有着以牛津广场为中心、半径为二十英里左右范围内的大片土地。
Generally no proof, just by the idea of painting, no a ruler and compass, but the Bank lines, straight lines and radius of graphics fold up to fit correctly ;
一般不打样，只凭构思绘画，也不用直尺和圆规，所画的中行线、直线和方圆图形，折叠起来能吻合不差；
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