扇: 扇动词1.(摇动扇子等使空气流动) fan 短语和例子把苍蝇从食物上扇走 fan the flies from the food; 扇火 fan a fire; 扇扇子 fan oneself; use a fan; 她用手帕扇脸。 she fanned her face with a handkerchief.2.(用手掌打) strike with the palm o
超声: hyperacoustichypersoundsuper soundsupersoundultra audible soundultra soundultra-acousticultraaudibleultraphonicultrasonic detecdorultrasonic q-switchultrasonic soundultrasonicsultrasound e
