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The universal cover of the double doughnut is a hyperbolic space
，这一点在体育直播中也有详细论述
And increased development will only exacerbate flooding – concreting over surfaces for housing or car parks prevents rain being absorbed and instead it runs off into drains and rivers which can become overwhelmed and breach defences.
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Grammarly is an accurate grammar checker for non-fiction writing whereas ProWritingAid is an accurate grammar checker for fiction writers.