A system and method are provided for transforming messages propagated in a distributed virtual world such as a Peer-to-Peer virtual world. In order for it to be possible for the cleaning machine to be manufactured more cost-effectively, it is proposed according to the invention that the drive shaft is made from metal, and that the torque-transmission member is formed, as a plastics-material molding, onto the drive shaft. The nerve stimulation lead also includes at least one anchoring unit disposed on the nerve stimulation lead. No tail flame is generated because only the powder in the second bullet is ignited. The secondary battery has a capacity characteristic of being able to supply the requested amounts of electric power of the electric power loads at least during an early stage following restart of operation of the fuel cell unit from a state of pause of operation.