Essentially, therefore, {HEAD ~ a thin water film} exists in {TAIL ~ the pores} of the sensor element, and the reaction occurs in this aqueous solution 
exists in
Essentially , therefore , { HEAD ~ a thin water film } exists in { TAIL ~ the pores } of the sensor element , and the reaction occurs in this aqueous solution
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH