Here's why:
* Translucent means that light can pass through the material, but it's scattered in the process, so you can't see clearly through it.
* Frosted glass allows light to pass through, giving a soft, diffused glow, but you can't see through it sharply. You can see shapes and outlines, but not details.
Other examples of translucent materials include:
* Wax paper
* Tissue paper
* Some types of plastic
* Thin fabrics
* Skin (to a degree)