SUFFIX (与数字连用构成副词)表示“…倍” -fold combines with numbers to form adverbs which say how much an amount has increased by. For example, if an amount increases fourfold, it is four times greater than it was originally. (与数字连用构成副词)表示“…倍”
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By the late eighties their number had grown fourfold.
到 80 年代末的时候，他们的数量已是原来的 4 倍。
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Pretax profit surged almost twelvefold.
税前利润几乎涨到了原来的 12 倍。
-fold also combines with numbers to form adjectives.
(与数字连用构成形容词)