a vegetative existence的用法和样例：
- He seemed doomed to a vegetable existence for the rest of his days.
- Since she suffered brain damage in the accident she's been a vegetable.
- Severe brain damage turned him into a vegetable.
- Stuck at home like this, she felt like a vegetable.
- The potato is a vegetable, not a fruit.
- The doctor put me on a vegetable diet.