The hydrogen permeable material exhibits excellent hydrogen permeability as well as excellent resistance to embrittlement caused by {HEAD ~ the permeation} of {TAIL ~ hydrogen} 
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The hydrogen permeable material exhibits excellent hydrogen permeability as well as excellent resistance to embrittlement caused by { HEAD ~ the permeation } of { TAIL ~ hydrogen }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL