amplitude
/ˈæmplɪtju:d; ?@ -tu:d; `æmpləˌtud/ n[U]
1 (fml 文) breadth; largeness; abundance 广阔; 广大; 丰富.
2 (physics 物) maximum extent to which a particular vibration, oscilation, radio wave, etc differ from the average 振幅; 波幅; 幅度
Sound waves are measured by their amplitude. 声波是根据其振幅来测量的.