词汇	pitch natural frequency
释义	pitch natural frequency 纵摇自然频率
随便看	fundamental difference fundamental differential invariant Fundamental Digital Electionics Fundamental Digital Electronic Technique fundamental digraph fundamental dimension fundamental dimensions fundamental directed family of points fundamental directed set of points fundamental direction fundamental disagreement fundamental discipline for chemical engineering fundamental discord fundamental discriminant fundamental disequilibrium fundamental distance fundamental distequilibrium fundamental disturbances fundamental doctrine fundamental domain fundamental dominant weight fundamental doublet fundamental driving force fundamental duality theorem fundamental duties of citizens