manual telephone exchange

常見例句

雙語例句

• A standard element of technology that can be traced to 1878 and the invention of the manual telephone exchange, the jack is apparently going the way of the floppy disk and the folding map.
  這一標(biāo)準(zhǔn)技術(shù)元素可追溯至1878年，來自人工電話交換系統(tǒng)。 它似乎正在步入軟磐和折曡地圖的後塵。
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