Then I want to make my index finger point towardS the surface.

然后让食指指向那个曲面。

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Now based on the three-dimensional reconstruction of point cloud, it is to make three-dimensional surface grid model through some algorithm.

目前基于点云的三维重建，大都是通过一些算法构造出三维表面网格模型。

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But it has low melting point and sintering point, when it is used to extinguish a fire, it can rapidly decompose to form a layer of film, which can cover the surface of comburent and make the fire.

但低聚磷酸铵具有较低的熔点和烧结点，用来灭火时能迅速分解形成膜层覆盖于燃烧物表面使火焰熄灭。

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