a tragic accident的用法和样例：
- The famous politician died in a tragic accident.
- His brother died in a tragic accident.
- He was killed in a tragic accident at the age of 24.
- There was a tragic accident on the highway yesterday.
- I have also been an expert witness at a tragic accident when a belay failed.
- When my mother had died after a tragic accident,he did not quickly recover from the shock and loneliness.