pitchupn.上仰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 of grooves槽间距pitching posture投球姿势pitch controller变桨距机构pitch perception音高知觉pitch deposition树脂沉积pitch cone angle节锥角pitch-recorder音调记录器,音波记录器pitch one's tentpitch estimation基因估计pitch-on metal涂沥青薄钢板