the base frame of a motor vehicle, carriage, or other wheeled conveyance (机动车、马车或其他有轮运输工具的)底盘 ■the outer structural framework of a piece of audio, radio, or computer equipment (音响器材、收音设备或电脑的)机座;机壳
语源
early 20th cent.: from French chassis 'frame', based on Latin capsa 'box' (see case)