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Fourfold means four times as much, or four times as many. If ten people came last year and there is a fourfold rise, forty come this year. You can put it before a noun (a fourfold increase) or after a verb (the number grew fourfold). It is a neat, slightly formal word — news, science, and reports like it; friends chatting usually just say “four times.” Though actually, people sometimes use it loosely, as if it only meant “a lot more,” not a careful count of four. If the exact number matters, “four times as much” is the clearer everyday way.
四倍
原始詞典資料5 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。
fourfoldadj/ˈfɔːfəʊld/
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Four times as great; quadruple.
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Comprised of four individual members.
- Most pupils have a fourfold object in studying a language; they wish to be able to read and write, to speak and to understand it.
fourfoldadv/ˈfɔːfəʊld/
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By a factor of four.
- And he shall restore the Lambe fourefold, because he did this thing, and because he had no pittie.
fourfoldverb/ˈfɔːfəʊld/
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To increase to four times as much; to multiply by four.
fourfoldnoun/ˈfɔːfəʊld/
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mathematicssciencesAn algebraic variety of degree 4.
- Our main application is to the classification of Poisson brackets on Fano fourfolds.
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。