mechanical matter is used to stay something by people
chemical_mechanical_planarization is not grinding. mechanical_equilibrium is not situation_involving_tangible_things. machine is mechanical_device. back_matter is matter. matter is anything. mechanical_equilibrium is situation_involving_tangible_things. matter is tangible_thing. chemical_mechanical_planarization is grinding. mechanical_mixture is not mixture. mechanical_fatigue is not tangible_physical_quantity.