a sinister smile的用法和样例：
- A sinister smile crept over his face.
- She had a sinister foreboding that the plane would crash.
- He was a sinister and crafty speculator.
- His eyes narrowed and took on a sinister cast.
- a baleful look; forbidding thunderclouds; his tone became menacing; ominous rumblings of discontent; sinister storm clouds; a sinister smile; his threatening behavior; ugly black clouds; the situation became ugly.