copper-lead-tin

例句：

1. 1. Copper is a soft, shiny metal that is used in many electrical devices.
   铜是一种柔软的闪亮金属，用于许多电气设备。
2. 2.Lead is a toxic metal that can cause serious health problems if it's not handled properly.
   铅是一种有毒金属，如果处理不当，可能会导致严重的健康问题。
3. 3. Tin is a soft, silvery metal that is often used in jewelry and other decorative items.
   锡是一种柔软的银白色金属，经常用于珠宝和其他装饰品。