a king incognito的用法和样例：
- That painting must be worth a king's ransom.
- She discarded a four, and picked up a king.
- They paid a king's ransom for the painting.
- The ruler of a kingdom is designated a king.
- An emerald of that size, unflawed, would be worth a king's ransom.
- He had the delusion that he was a king.