ace up (one's) sleeve 秘密王牌，錦囊妙計
A secret plan, idea, or advantage that can be utilized if and when it is required.
My stamina is the ace up my sleeve for this race—the other runners don't stand a chance!
我的毅力是我赢得這場比賽的王牌-其他選手根本沒有機會。
The defense attorney waited for just the right time to play the ace up her sleeve—
a new eye-witness.
辯護律師等着在恰當的時間亮出它的殺手锏：一個新的目擊證人。
She's keeping all the details of their unscrupulous business practices as an ace in her
sleeve should they ever try to fire her.
她把他們不擇手段的商業行為的所有細節都掌握在自己手裡，以防他們想要解雇自己。
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