Moreover, the etching selectivity allows {HEAD ~ a large work control width}, which facilitates {TAIL ~ the work} 
facilitates
Moreover , the etching selectivity allows { HEAD ~ a large work control width } , which facilitates { TAIL ~ the work }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL