octave-spanning英'ɒkteɪvsp'ænɪŋ美'ɒkteɪvsp'ænɪŋCOCA³¹⁵¹¹¹⁺⁴ 基本例句 倍频程¹⁰⁰ They measured the radio frequency instead of optical frequency measurement with optical frequency comb and technology of octave-spanning. 利用光频梳和倍频技术，把对光频的测量变为对射频的测量，这样就能够很容易地测出光的频率。 cnki