a vitamin antagonist的用法和样例：
- His mother told him to have a vitamin pill before leaving.
- Is the skin dry how to solve? Lack a vitamin?
- His mother told him to have a vitamin pillbefore leaving.
- Half were enrolled on the basis of a physician's judgment that a vitamin K antagonist was inappropriate for the patient; no strict case definition for "unsuitable" was used.
- A substance that destroys or inhibits the metabolic action of a vitamin.