Non-slip surface: The bottom of bathtub should have non-slip surface to guarantee your safety.
防滑表面：浴缸底面须有防滑表面，确保您的安全。
The slip surface is searched through moving the three geometric control points on the ground surface, the bottom of excavation and the surface at half of the height of the excavation, respectively.
通过分别移动基底、地表水平面和位于基坑高度一半处的水平面上的三个几何控制点，寻找到边坡最危险滑移面并计算出对应的稳定性安全系数。
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