stratagem|stratagems

他设计了一个巧妙的计谋来赢得比赛。

He devised a clever ___stratagem to win the competition.

间谍使用各种诡计来获取敌方机密。

The spy used clever ___stratagems to obtain the enemy's secrets.

这个将军的战术策略成功迷惑了敌人。

The general's ___stratagem successfully deceived the enemy.