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pitching system俯仰系统pitching flying俯仰飞行pitch gyroscope俯仰陀螺仪pitch of thread螺距pitch fibrepipe沥青纤维管pitch frequency音调频率Pitch disorders音调障碍pitch smoke dust沥青烟尘pitch shortening绕组节距缩短pitch correction螺距修正,俯仰修正