dial tone
柯林斯詞典
1. N-COUNT The dial tone is the same as the . 同dialing tone[美國(guó)英語(yǔ)]
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dial tone (dial tones)
劍橋詞典
- a continuous sound that tells you that a phone is connected to the phone system and is ready to be used
（電話(huà)）撥號(hào)音 返回 dial tone