a masked bandit的用法和样例：
- On her way home, a masked bandit with a broadsword in the hand suddenly rush to her and robbed her bag away.
- He wore a mask so that no one should recognize him.
- Three masked bandits stuck up a bank yesterday.
- Such feelings tend to remain submerge beneath a mask of social politeness.
- Her sociable manner is really a mask for a very shy nature.
- He conceals his worries behind a mask of nonchalance.