chassis
noun [ C ] uk/ˈʃæs.i/ us/ˈtʃæs.i/ chassis /ˈʃæs.iz/ /ˈtʃæs.iz/
（车辆的）底盘
the frame of a vehicle, usually including the wheels and engine, onto which the metal covering is fixed
The car's lightweight chassis is made from aluminium sheets. 这种汽车的轻型底盘是用薄铝板制成的。