Except for acting as paths of hydrogen, the filtering rod 308 also has {HEAD ~ the function} of filtering {TAIL ~ impurities} and other gases 
of filtering
Except for acting as paths of hydrogen , the filtering rod 308 also has { HEAD ~ the function } of filtering { TAIL ~ impurities } and other gases
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH