a forlorn look的用法和样例：
- She had a forlorn look on her face.
- Then with a forlorn look about him,he straightened up.
- Then with a forlorn look about him,he straightened up."I guess I best be goin', " he mumbled and headed slowly towards the gate.Without hesitation,Jacky followed at his heels.
- A forlorn and shipwrecked brother.
- Going to their rescue in a rowing-boat is a bit of a forlorn hope.