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Conclusion: the HN 97 porcelain stain is smooth on the surface and firm in combination with body porcelain after firing.
结论：HN 97金属烤瓷外源性着色剂是一种表面光滑且与体瓷结合牢固的着色剂。
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Porcelain is also stain-resistant, just like real teeth.
就像真牙一样，烤瓷牙所用的瓷料也能抵抗斑点的产生。
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