| Back | 一个频带的上下界频率之差，单位用赫兹表示。 |
|---|---|
| Front | yī gè píndài de shàngxià jiè pínlǜ zhī chà dānwèi yòng Hèzī biǎoshì The difference, expressed in Hertz, between the two limiting frequencies of a band. |
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