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