a sickly smile的用法和样例：
- He summoned up a sickly smile for camera.
- Her husband looked at her with a sickly smile.
- I've tried to sell my little lot several times already, said Pidlum with a sickly smile.
- She gave me a sickly smile.
- Her cheeks have a sickly pallor.
- It gave off a sickly, oily smell.