核心畫面
You can think of it as the plain number 70 first — seven tens, used to count, to say how far, how long, how much, how old. The other three meanings are not extra meanings of the bare word: they are fixed phrases that use 70 as the opening of a ten-year or ten-degree stretch, so "the seventies" covers 70 up to 79, whether those are years, ages, or degrees.
可以先想成單純的數目 70——七個十。它做的是數字最基本的事：數東西、講長度距離、講價錢、講年紀。另外三個意思其實不…更多收起
可以先想成單純的數目 70——七個十。它做的是數字最基本的事：數東西、講長度距離、講價錢、講年紀。另外三個意思其實不是這個字自己多長出來的意思，而是幾個固定說法：它們都拿 70 當一段「十格區間」的起點，所以 the seventies 指的是 70 到 79 這一整段——可能是年份、可能是歲數、也可能是華氏溫度，看句子裡在講什麼。原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Seventyname
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The translators of the Septuagint
- The Seventy have totally miſrepreſented Iſaiah viii.14, 15 […].
- It was impossible to avoid pagan terminology altogether, however, and the Seventy relaxed their vigilance when dealing with poetry.
seventynum/ˈsɛv.ən.ti/
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The cardinal number occurring after sixty-nine and before seventy-one, represented in Roman numerals as LXX and in Arabic numerals as 70.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。