棱锥

例句：

1. 1. The artist used a prism to create the rainbow effect in his painting.
   艺术家使用棱镜在他的画作中创造了彩虹效果。
2. 2. The prism is a useful tool for measuring light wavelengths.
   棱镜是一个测量光波长的有用工具。
3. 3. The prism was used to separate different colors of light before they were mixed together.
   棱镜被用来在混合之前分离不同颜色的光。