{HEAD ~ The member} 12 is made of a material having a low coefficient of {TAIL ~ thermal expansion} and high thermal conductivity, such as sapphire or ruby 
{ HEAD ~ The member } 12 is made of a material having a low coefficient of { TAIL ~ thermal expansion } and high thermal conductivity , such as sapphire or ruby
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH