rubble-mound structure 抛石防波堤 ; 抛石建筑物
pit-and-mound structure 坑丘构造
gravity structure on submerged mound 坐底型重力式结构物
mound structure
堆结构
以上为机器翻译结果，长、整句建议使用 人工翻译 。
And the first scene does suggest that we're starting at the very beginning: In a primordial swamp of sorts, brightly costumed frogmen bounce around and swing on a mound-shaped structure.
WSJ: Culture City: An Opera Vet Tries to Raise The Circus
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