a treacherous memory的用法和样例：
- A treacherous fellow is the Shark.
- I know of you Red Wizards. You are a treacherous lot.
- A treacherous coward who betrayed his friends to save his own skin.
- This was a treacherous act of betrayal by the Irish.
- He is a treacherous and ferocious person who is prepared to intimidate others.