他们鉴定出四种不同的含铅物质，其中两种是人工合成的，并非天然物质。
They identified four different lead-based substances, two of which were man-made, not natural.
它的稳定性特佳，特别用在含低铅及硼的釉料中。
It is very stable, particularly in glazes with a low lead and boron content.
含铅颜料是主要的铅污染源。
含铅颜料是主要的铅污染源。
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