This discolouration is completely harmless.

这种变色是完全无害的.

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Dual - action toothpaste with Xylitol and baking soda to remove stains and surface discolouration from teeth.

这种双重作用的牙膏,含有木糖醇和小苏打,能清除牙齿表层的污垢和污色.

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Discolouration of silver and basketry - inlaid silver artwares and the protection technology were studied.

研究了含有少量铜锌成分的银片或银丝笆镶嵌的银制工艺品变色及各种新工艺的防变色效果.

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Shake well before use. Test in an inconspicuous area prior to first use to avoid discolouration.

用前先摇匀, 初次使用前先在不显眼处试用,以确定皮具是否会褪色或变色.

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