The spiral stairway is one of the main auxiliary equipments of large spherical vessels.
作为大型球形容器主要附属设备之一的盘梯，其最佳设计方案应该是等倾角上升的。
Straight on, a tilted stairway of pale marble rose up out of the dark water in a graceful spiral, ending abruptly ten feet above their heads.
再往前直走，一座优雅的盘旋而上的苍白大理石石阶从昏暗的水中升起在他们头顶约十英尺的地方戛然而止。
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