A steam turbine includes a turbine casing, in which a turbine rotor is accommodated so as to extend along a direction of flow of steam, and a plurality of turbine pressure sections are mounted to the turbine rotor, which includes, in combination, at least two or more of a turbine high pressure portion, a turbine intermediate pressure portion and a turbine low pressure portion. The fluid detector includes at least two optical conductors, optical detectors coupled to outputs from the optical conductors; and a comparer for comparing the outputs from the detectors. Further, the temperature of the constant-temperature water supplied from a constant-temperature water supply apparatus into the constant-temperature container is set to be a little bit higher than that of the water-vapor atmosphere supplied from the water-vapor generating apparatus 100. The user control module includes a user control and the transmitter module includes a radio frequency transmitter. Further, by displacing the lid and gate, substantially un-blocking the first opening and second opening, trash bags can be laterally removed from the trash dispenser andor can be removed without being required to be lifted solely vertically.