fretted lead

例句：

1. 1. The artist'suse of color in his paintings is oftenfretted lead.
   这位艺术家在他的画作中使用的颜色常常是纠结的铅。
2. 2. Thescientist found the metal to be fretted lead, which made it difficult towork with.
   这位科学家发现这种金属是纠结的铅，这使得它难以使用。
3. 3.The engineer had to remove the fretted lead before he could start working onthe project.
   工程师在开始这个项目之前必须移除纠结的铅。