blacklead

例句：

1. 1. The blacklead was used to make the ancient Egyptians' pyramids.
   黑铅被用来制作古埃及金字塔。
2. 2. The blacklead mine is a popular tourist attraction.
   黑铅矿是一个受欢迎的旅游景点。
3. 3. The blacklead was used in the construction of the ancient city walls.
   黑铅被用于古代城墙的建设。