词汇	unknown known
释义	unknown known 🌏未知的已知；自己知道
随便看	low frequency automatic inspection low frequency band low-frequency band low frequency band color recording low frequency beacon low-frequency beacon low frequency beat low-frequency beat low-frequency beats low frequency blood group low-frequency low frequency absorption Low-Frequency Accelerometer Flutter low-frequency accelerometer modes low frequency ac coded track circuit low frequency a.c.generator Low Frequency Acoustic Vernier Analyzer low frequency acquisition low-frequency acquisition low frequency acquisition and ranging Low-Frequency Acquisition and Ranging low frequency blood group antigen low frequency blood group g low-frequency bypass low frequency cable