Telephony is the whole business of sending voices over a distance — the systems, the equipment, and the service, taken together as one idea. It is not a single phone and not a single call; it is the technology as a field.

Telephony電話通訊 is the whole business of sending voices over a distance是把聲音傳送到遠方這整件事 — the systems, the equipment, and the service, taken together as one idea系統、設備、服務全部加在一起，當成一個整體概念。It它 is not a single phone and not a single call指的不是單一支電話，也不是單一通電話; it而是 is the technology as a field整個領域的技術。

Engineers, phone companies and IT people use this word: 'mobile telephony', 'internet telephony', 'the telephony market'. An ordinary person almost never says it — they say 'phones' or 'phone service'.

Engineers, phone companies and IT people工程師、電話公司、IT人員 use this word會用這個詞: 'mobile telephony'「mobile telephony行動電話通訊」, 'internet telephony'「internet telephony網路電話通訊」, 'the telephony market'「the telephony market電話通訊市場」。An ordinary person一般人 almost never says it幾乎不會這樣說 — they他們 say 'phones' or 'phone service'會說「phones電話」或「phone service電話服務」。

So the feeling is technical and slightly formal, the kind of word you meet in a company report, a news article about a telecom company, or a job title like 'telephony engineer'. You will very often see it with a word in front that names the kind: 'digital telephony', 'IP telephony' (calls carried over the internet instead of old phone wires).

So所以 the feeling is technical and slightly formal這個字給人的感覺是技術性、稍微正式的, the kind of word you meet in a company report, a news article about a telecom company, or a job title like 'telephony engineer'是你會在公司報告、電信公司的新聞報導，或「telephony engineer電話通訊工程師」這種職稱裡遇到的字。You你 will very often see it with a word in front that names the kind很常會看到它前面加一個字說明是哪一種: 'digital telephony'「digital telephony數位電話通訊」, 'IP telephony' (calls carried over the internet instead of old phone wires)「IP telephony網路電話」（透過網路而不是舊式電話線傳輸的通話）。

Note that it is uncountable — you do not say 'a telephony' or 'two telephonies'.

Note that it is uncountable要注意這是不可數名詞 — you do not say 'a telephony' or 'two telephonies'不會說「a telephony」或「two telephonies」。