a born-unlucky man的用法和样例：
- Her husband is such a bear that nobody likes him.
- The pendulum of the clock in my room is a bear.
- The old man is a bear; he is always grumbling.
- She was considered a born movie star.
- That old man is a bear, he is always grumbling.
- There is a bear in the inmost recesses of the cave.