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The vertical distance from crest to spill plane is the closure of the trap.
从圈闭顶部到溢出面的垂直距离称为圈闭的幅度。
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The pillars are attached to the external closure, which allows having the entire floor available except the vertical communication core.
支柱连接到外部结束，这使得整个地板除了垂直的核心筒部分都是一体的。
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