suspension: a mechanical system of springs or shock absorbers connecting the wheels and axles to the chassis of a wheeled vehicle
mechanical system: a system of elements that interact on mechanical principles
passeriformes: largest order of birds comprising about half the known species; rooks; finches; sparrows; tits; warblers; robins; wrens; swallows; etc.; the four suborders are Eurylaimi and Tyranni and Menurae and Oscines or Passeres