| 摘要 |
A fuel cell system includes: a fuel cell main body having a fuel cell; a fuel storage portion coupled attachably and detachably to the fuel cell main body for storing fuel to be supplied to the fuel cell; and a coupling portion which couples between the fuel cell main body and the fuel storage portion. In the system, a fuel having a concentration lower than that of a fuel stored in the fuel storage portion is allowed to flow through the coupling portion.
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