2. to talk over (one's) head(s): to use large or big words so that audience will not understand exact meaning(指所谈论的内容过于专业或高深,非一般人可以理解;也指有人为了表現自己才学非凡,故意谈些高深理论或用些难字,吓唬別人)
Dr. Lee's lecture was so specialized that he almost talked over our heads. (李博士的演讲太专业了,几乎使我们无法理解.)
In order to show his profound knowledge he talks over my head. (为了表現他的学问高深,他故弄玄虚.)