Here's why:
* ASL is a visual language: Signs often depict the meaning of a word rather than being directly related to the spoken word.
* "Cavity" is a complex concept: It refers to a hole or space, which could be in a tooth, a building, or even the Earth.
To communicate the concept of "cavity" in ASL, you would likely need to use signs that convey the context:
* For a tooth cavity: You might use a sign for "tooth" and then a sign for "hole" or "decay."
* For a cavity in a building: You might use a sign for "building" and then a sign for "empty space" or "hole."
It's important to remember that ASL is a dynamic language and signs can vary depending on the region and individual signers.