{HEAD ~ A fuel cell} adopting {TAIL ~ the liquid tank} maintains the liquid level in the tank near 50% of the full level even when the fuel cell is rotated 
adopting
{ HEAD ~ A fuel cell } adopting { TAIL ~ the liquid tank } maintains the liquid level in the tank near 50 % of the full level even when the fuel cell is rotated
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH