opaque body

例句：

1. 1. The molecule is composed of an opaque body that absorbs light.
   这个分子由一个不透明体组成，能吸收光。
2. 2.The opaque body of the skin provides protection against UV rays.
   皮肤的不透明体提供了对紫外线的保护。
3. 3. The opaque body of the crystal is responsible for its color.
   晶体的不透明体是其颜色的原因。