卵形截面柱壳 Egg-shaped cylindrical shell
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本文根据已经在欧洲与美国使用了两个世纪的卵形(也就是“蛋形”)截面的下水道说明采用这种方案的背景。
The paper demonstrates the background to such solutions based on the ovoid or 'egg-shaped' cross-section sewers that have been used in Europe and the us for two centuries.
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