the third step of arranging another member on the joining layer and heating the joining layer to not less than a temperature which is a melting point of {HEAD ~ boron oxide} for {TAIL ~ a predetermined period} of time 
for
the third step of arranging another member on the joining layer and heating the joining layer to not less than a temperature which is a melting point of { HEAD ~ boron oxide } for { TAIL ~ a predetermined period } of time
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 TAIL TAIL OTH OTH