It is preferable that {HEAD ~ the average particle diameter} of solid components contained in the paste be {TAIL ~ less than about 10 μm} 
be
It is preferable that { HEAD ~ the average particle diameter } of solid components contained in the paste be { TAIL ~ less than about 10 μm }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL