In {TAIL ~ the former case}, for example, a groove serving as a channel is formed on the surface of {HEAD ~ the substrate} 
In { TAIL ~ the former case } , for example , a groove serving as a channel is formed on the surface of { HEAD ~ the substrate }
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD