蒙在鼓里    be kept in the dark
【注音】mēng zài gǔ lǐ
【解释】对发生的与自己有关的事情一点儿也不知道。
The person concerned is totally unaware of what is going on.
【例子】
例：这件事除了徐秘书，别人都还蒙在鼓里呢。
Ex.：This matter was kept a secret from everyone except the secretary Xu.
拿手戏    the play that an actor does best
【注音】ná shǒu xì
【解释】某人最擅长的技术、能力。
Used figuratively to mean one's specialty or forte.
【例子】
例：一边打电话一边用电脑工作是小曹的拿手戏。
Ex.：Making phone calls while working on computer at the same time is Xiaocao's specialty.