Special zone divides into 3 areas, : Meng pull, south Bang, colour rein.

特区分为3个地区，即：勐拉、南邦、色勒。

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The values based on the three stimulation value were adopted for the colour selection and tooth colour matches from nine zone colors with 21 point smoothly transitional calculation.

采用一种基于三刺激值的相对选色方法及2 1点平滑牙色过渡算法的九分法的牙齿颜色匹配；

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