frequently的近义词有：always, often, usually, frequently, repeatedly, regularly。下面这些副词均表示频度always ：总是，永远。语气最强，指在一切时候，没有例外。often ：经常，语气弱于always,侧重动作发生的次数具有经常性，具体时间意味不强。usually ：通常，通例地，指习惯性动作，频度仅次于always，较often大，偶尔有间隔。frequently...

For an initial service, a 10 megahertz-wide band of frequencies will be needed.初始服务需要10兆赫宽的频带。Of an electronic circuit or device; having an output proportional to input; amplifying or attenuating all frequencies equally....