  title="" class="an ">&ensp;</span>ear <span  title="" class="an ">&ensp;</span>where <span  title="" class="an ">&ensp;</span>it <span  title="" class="an ">&ensp;</span>has <span  title="" class="an ">&ensp;</span>proposed <span  title="" class="an ">&ensp;</span>roles <span  title="" class="an ">&ensp;</span>in <span  title="" class="an ">&ensp;</span>sensing <span  title="" class="an ">&ensp;</span>sound <span  title="" class="an ">&ensp;</span>painful <span  title="" class="an ">&ensp;</span>cold <spa