sentences: photovoltaic invention pervert sound matter into combining / electrical matter
docs: electrical_relay is tangible_thing. silicon_tetrafluoride is tangible_thing. photoresist_deposition is semiconductor_wafer_processing_single_wafer. sound is mechanical_phenomenon. quaver is sound. sound is physical_phenomenon. electrical_inductance is multi_dimensional_quantity. homemade_time_bomb is tangible_thing. n_well_creation is semiconductor_wafer_processing_single_wafer. p_well_creation is semiconductor_wafer_processing_single_wafer.