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1·But then I happened to read that lead in paint makes colors (particularly yellow and red) brighter and last longer; because lead costs less than alternates, cheaper toys are more likely to contain it.

可后来我偶然学到了一点知识：涂料中所含的铅有让色彩更艳丽、使油漆更耐用的作用，特别是红色及黄色涂料；而由于含铅涂料要比其他代用涂料便宜，因此，便宜的玩具含铅的可能性更高。

2·Paint the tooth flank of the big bevel gear with a thin and equal red lead coat.

即在大锥齿轮的齿面上涂一层薄而均匀的红铅油，然后转动齿轮数圈。

3·Moreover there is still a third compound red lead the well-known paint.

此外，还有第三种化合物：红铅，是人们熟悉的颜料。

4·For instance, a list of Leonardo's materials reveals that he used white paint containing lead and bright red paint containing mercury17.

例如，根据达·芬奇的绘画用料表可知，他所使用的白色颜料里含有铅，亮红色颜料里含有汞。