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It is unknown what causes this colouration.
它是不明原因，这成色。
youdao
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With this special requirement of surface colouration, general dyeing process is not available.
对于这种表面着色的特殊要求，一般染色工艺是达不到的。
youdao
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With this special requirement of surface colouration, general dyeing process is not available.
对于这种表面着色的特殊要求，一般染色工艺是达不到的。
youdao