friction

n.摩擦；不和

freshener, fresher, freshly, freshman, freshness, freshwater, fret, fretful, fretfully, fretsaw, fretwork, Freudian, Freudian slip, Fri, friability, friable, friar, friary, fricassee, fricative, Friday, fridge, fridge-freezer, fried, friend, friendless, friendliness, friendly, friendly match (also friendly), friends, friendship, frieze, frig, frigate, frigging, fright, frighten, frightened, frightening, frighteningly,