{TAIL ~ Each surrounding body} 10 is {HEAD ~ a thin metal plate}, the area of which can be adjusted as desired 
{ TAIL ~ Each surrounding body } 10 is { HEAD ~ a thin metal plate } , the area of which can be adjusted as desired
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH