- fire concentration
- 火灾: fire; conflagration
- 频度: ddds; frequence; frequency count
- 火灾: fire (as a disaster); conflagration◇火灾保险 fire insurance; 火灾保险公司 [英国] fire company; 火灾监测 fire monitoring; 火灾控制 fire control
- 倍频度: octave
- 调频度: wanted rate; warble rate
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