masterstroke /ˈmɑːstəˌstrəʊk/

• 1. 

  N-COUNT A masterstroke is something you do which is unexpected but very skilful and which helps you to achieve something. 妙举; 绝招 [usu sing]

  例：

  His promise during the campaign to try to bring the war to an end was a political masterstroke.

  他在选举中承诺努力结束战争是个政治高招。