SpriteRenderer 将精灵渲染为 9 切片图像，其中角保持不变，其他部分平铺。
在该绘制模式中，角保持不缩放，而其他部分重复，而不是拉伸。它使用 Sprite.border 的值确定每个部分（边界和中心）的平铺方式。
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