a heat receiving portion to couple to a heat generating unit, {HEAD ~ the heat receiving portion} has {TAIL ~ a recess} corresponding to the heat generating unit 
a heat receiving portion to couple to a heat generating unit , { HEAD ~ the heat receiving portion } has { TAIL ~ a recess } corresponding to the heat generating unit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH