pitchyadj.沥青的；涂沥青的；沥青似的；漆黑的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 vt.沥青,音高 ?pitch chain校准链,节链,短环链pitch meter螺距测量器pitch point节点,齿轮啮合节点pitch adder俯仰角加法器pitch brace活塞拉杆pitch names音名pitch stick螺距调整杆pitch hinge变距铰pitched out投坏球