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