单词	虎下脸
释义	虎下脸 hǔxià liǎntopo. present a stern face
随便看	differential mapping differential mass balance differential measurement differential measuring instrument differential mechanism differential medium differential melting differential mesh equation differential metals contact corrosion differential method differential method for calibrating thermocouple differential method of liquid level measurement differential method of measurement differential micro-manometer differential micrometer differential microphone differential migration differential mitosis differential mitosis (bauer 1952) differential mobility differential mode differential mode attenuation differential mode current differential mode delay differential mode disturbance voltage