a dull headache的用法和样例：
- Dr. Howard Bennett of George Washington University Medical Center wrote in a letter to this week's New England Journal of Medicine that the three children, ages 8 to 10, experienced a dull headache for two or three days.
- The dying fire was throwing out a dull red light.
- I feel a dull pain in the stomach.
- He felt a dull ache in his shoulder.
- All work and no pay makes Jack a dull boy.