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- The system was based on the Dual Tone Multifrequency (DTMF) signals that could be sent through a loop of wire to switch on/off various appliances via a Personal Computer (PC). 首先用清晰的流程图展现了各个模块在整个系统中的功能以及互相之间的有机联系；
- dual tone multifrequency receiver 双音多频接收机
- dual tone multifrequency oscilltor 双音多频振荡器
- Real-Time Digital Filter and Decoding of Dual Tone Multifrequency Signal 双音多频信号的实时数字滤波译码
- double tone multifrequency(DTMF) 双音多频（DTMF）传输
- dual - tone multifrequency 双音多频
- dual tone multifrequency 双音多频
- Swimming is the best way to tone up your body. 游泳是健体强身的最好方法。
- The road opened out into a dual carriageway. 这条路已扩展成了复式车行道。
- His peremptory tone of voice irritated everybody. 他那专横的口气激怒了大家。
- He had an arrogant tone of voice. 他流露出傲慢的口气。
- Don't speak in an authoritative tone. 不要用一种命令的口吻说话。
- Does the furniture tone in with the curtains? 家具与窗帘的搭配协调吗？
- He often speaks in an arrogant tone. 他经常以一种傲慢的口气说话。
- The bright blue wilt tone down with the effect of sunlight. 阳光一照射这明亮的蓝色就会柔和下来。
- I dislike his airy tone of voice. 我讨厌他那做作的声调。
- These exercises will tone up your muscles. 这些运动方式会强健你的肌肉。
- She spoke in a brisk tone of voice. 她用尖刻的语调说话。
- His dual role as a composer and a conductor made him very busy. 他作曲家和指挥家的双重身份使他非常繁忙。
- She spoke in a confidential tone of voice. 她用信任的口吻说。
