a vitamin pill的用法和样例：
- His mother told him to have a vitamin pill before leaving.
- As a friend of mine said, "a little indulgence is good, its like taking a vitamin pill.
- Garlic &Vitamin Pill for Heart Disease?
- Is the skin dry how to solve? Lack a vitamin?
- I'm sure this vitamin pill will do wonders for your health.
- His mother told him to have a vitamin pillbefore leaving.