1、A secret plan to accomplish a hostile or illegal purpose; a scheme.
陰謀，計劃為達到一個有敵對性或非法的目的而制定的秘密計劃；方案

2、He made an allusion to a secret plan in his speech.
在講話中他暗示有一項秘密計劃。

3、He made an allusion to a secret plan in his speech
在講話中他暗示有一項秘密計劃。

4、A secret plan to accomplish a hostile or illegal purpose; a scheme
陰謀，計劃為達到一個有敵對性或非法的目的而制定的秘密計劃；方案

5、You aren't allowed to enter into meeting room because a secret plan is being made.
你不允許進入會議室，因為里面正在進行一項秘密計劃。