| 单词 | number-unobtainable |
| 释义 | > as lemmasnumber-unobtainable number-unobtainable adj. denoting a sound indicating to a caller that the telephone number dialled is unobtainable for a reason other than its being engaged. ΚΠ 1930 Gloss. Terms Telegraphs & Telephones (B.S.I.) 47/1 Number-unobtainable tone. 1969 ‘D. Rutherford’ Gilt-edged Cockpit viii. 148 He listened..to the high whine of the ‘number unobtainable’ signal, knowing that she had left the receiver off. 1984 J. Dunlop & D. G. Smith Telecommunications Engin. x. 320 Note that if an unallowed number is dialled, or service to the number dialled has been discontinued, number-unobtainable tone is returned to the caller. < as lemmas |
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