sentences: a somewhere is a sink of electrical matter / carbon
docs: carbon is solid. carbon_sink is carbon_dioxide. storage is somewhere_to_put_things. oil_flow_station is tangible_thing. sink is part_of_room. electrical_hazard is dangerous_thing. drain_wire_transistor is tangible_thing. electrical_inductance is electrical_quantity. sink is tangible_thing. electrical_hazard is tangible_thing.