The displacement characteristic show that the cave bottom as curve fulcrum and displacement takes on a flat shape curve which offsets to the empty direction.
位移特征上，表现为以内侧硐底为支点，向临空面方向偏移的扁形曲线。
The displacement characteristic show that the cave bottom as curve fulcrum and displacement takes on a flat shape curve which offsets to the empty direction.
位移特征上，表现为以内侧硐底为支点，向临空面方向偏移的扁形曲线。
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