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

I was founded in 2005, is one of Yunnan Copper Group Holdings production of lead-based products of the limited liability company.

我公司成立于2005年，是一家云铜集团控股的生产铅产品为主的有限责任公司。

youdao

Because it and its compounds are poisons (see lead poisoning), lead-based paints and gasoline additives have been phased out in many countries.

由于铅和铅化物具有毒性，因此含铅的颜料和汽油添加物现已被禁用。

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