a dose of cod-liver oil的用法和样例：
- I want a bottle of cod liver oil.
- LYSI soon became the largest producer of cod liver oil in Iceland.
- A woman bought a bottle of cod liver oil to give to her dog so he could have a healthier and shinier coat.
- A dose of this stuff will purge you!
- Plus, if you were to actually take two tablespoonfuls of cod liver oil on a daily basis, you would eventually begin to suffer from hypervitaminosis A (a fancy way of saying vitamin A overdose).