a run of bad luck的用法和样例：
- Nancy had a run of bad luck.
- His recent run of bad luck has cooled him off.
- After a run of bad cards, James decided he had lost enough money and threw in his hand.
- His recent run of bad luck has cooled him off toward the games.
- a succession of failures; had a streak of bad luck; Nicklaus had a run of birdies.