盒阴影的结构和text - shadow相同，x轴偏移，y轴偏移，模糊，颜色。

The structure for box shadow is same as the text-shadow property: x-offset, y-offset, blur, and color.

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灵活的盒布局模型：如何自动边缘在交叉轴方向的行为？

Flexible box layout model: How should auto margins in the cross-axis direction behave?

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该算法以层次包围盒(obb)为基础，通过为每个骨骼模型建立包围盒，运用分离轴理论计算包围盒的相交测试。

Based on OBB (oriented bounding box), this algorithm constructs an OBB for each bone model and computes intersect tests of the OBB with separation axis theory.

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