英语习语 | play your ace 打出王牌、使出绝招

play your ace
打出王牌、使出绝招

• Do not play your ace in the hole until the critical moment.
  不到关键时刻不要亮出你的绝招。
• The general decided to play his ace and send in the tanks.
  将军决定使出绝招，派坦克参加战斗。