High - quality coral is of an even colour and free of cracks, blotches, striations and holes.
优质的珊瑚会显现出均衡的色彩及无裂纹无班点无纹里或无蛀洞。
Even skin colour has an influence, as people with darker skin find it more difficult to produce the vitamin.
甚至肤色也会有影响，由于有较深肤色的人们被发现更难以产生维生素。
Even skin colour has an influence, as people with darker skin find it more difficult to produce the vitamin.
甚至肤色也会有影响，由于有较深肤色的人们被发现更难以产生维生素。
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