EXPRESSION ON somebody'S FACEshowing no expression on your face 面无表情的,不动声色的
a poker-faced officer
面无表情的警官
—poker face noun [singular]
Examples from the Corpus
poker-faced• The checkers at the airport were poker-faced but affable.• He champed on his gum in time to the music, and kept a poker-faced expression.• Throughout his treatisePopemaintains the pose of the poker-facedinstructor.• Not even Will Rogers could make the poker-faced President laugh.