Example sentences of "[prep] [noun pl] [adj] than about " in BNC.

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1 Dating baked clay and burnt stone are perhaps the most interesting archaeological applications of TL , because these — in particular burnt flint — allow the dating of sites older than about ten thousand years , when the first pottery began to appear .
2 Molecular hydrogen is rather fragile ( in interstellar terms ) , and is destroyed by shock waves with velocities greater than about 50 km s -1 and can not exist behind the leading shock .
3 In a very real sense , the SD Ribbon is what you make of it , and should be shortlisted , subject to the remarks made above , by those with ( or contemplating purchasing ) a high performance system costing in excess of £4000 or so , and with rooms larger than about 4 x 3 meters .
4 At latitudes greater than about 40° the banding is less clear , and in the polar regions it is replaced by smaller-scale cellular features .
5 At wavelengths shorter than about 104 nanometres , there are no materials suitable for use as windows to transmit the radiation into the vacuum chamber .
6 At depths greater than about 100 km the wave speeds are rather uncertain .
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