{HEAD ~ A planetary gear mechanism} combines the rotational drive force of a first shaft rotationally driven by a first rotary electric machine and the rotational drive force of a second shaft rotationally driven by a second rotary electric machine and transmits {TAIL ~ the combined rotational drive force} to a drive shaft with the rotational speed increased 
{ HEAD ~ A planetary gear mechanism } combines the rotational drive force of a first shaft rotationally driven by a first rotary electric machine and the rotational drive force of a second shaft rotationally driven by a second rotary electric machine and transmits { TAIL ~ the combined rotational drive force } to a drive shaft with the rotational speed increased
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