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