Pitchon皮琼pitchn.球场；程度；音调；推销；投掷；街头商贩摊位；沥青；树脂；松脂v.投；颠簸；搭帐篷；定调；推销；用沥青覆盖pitch deteetor基音检测器pitch of teeth齿距pitching rules投球规则pitch recorder音高记录器,音调记录器,纵摇记录仪pitch equality“音高平等”pitch shifting变调pitching drive俯仰驱动pitch interval音程,间距pitch on metal涂沥青薄钢板pitch contours音高升降曲线