They identified four different lead-based substances, two of which were man-made, not natural.

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。

youdao

It points out the research direction of the functional materials of lead-based titanate ceramics.

为钛酸铅系功能陶瓷及材料的研究指明了方向。

youdao

The progress in study of reaction mechanism of preparation of lead-based relaxor ferroelectric ceramics is reviewed in this paper.

综述了制备含铅基弛豫铁电陶瓷的化学反应机理的研究进展，提出改进铅系弛豫铁电陶瓷制备技术几点措施。

youdao

A new study shows that lead-based paint remains a worldwide threat to public health.

VOA: special.2009.08.31

He and his team are calling for a worldwide ban on lead-based paint.

VOA: special.2009.08.31

secretary-general to lead, coordinate and advocate efforts to end gender-based violence in armed conflict.

VOA: standard.2009.09.25

Some of the older pigments are lead-based and difficult to acquire because of EU health-and-safety regulations.

WSJ: Forging Ahead With a Goya Classic

Three of four lead-based figures were taken from a park where they had stood since 1926.

BBC: Metal theft: Britain's most annoying crime wave

Moreover, if history provides any indication, choking on toys is a far greater hazard for children than lead-based toys.

FORBES: Toying With China