Someone's mannerisms are the gestures or ways of speaking that are very characteristic of them, and which they often use. (说话或动作特有的)习性
noun [抽象名词] 特殊习惯；矫揉造作；怪癖
His mannerisms are more those of a preoccupied maths professor. 他的言谈举止更像是一个全神贯注的数学教授。
