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threefold + noun
The company reported a threefold increase in profits.
该公司报告利润增长了三倍。
三倍的
先理解核心含义，再看它在真实句子里的用法。
三倍的
Three times as great; triple.
The company reported a threefold increase in profits.
该公司报告利润增长了三倍。
三倍大的。
Three times as great.
三重的。
Triple.
The new subway line caused a threefold increase in property values nearby.
新的地铁线路使附近房产价值增长到原来的三倍。
The population of the town is now threefold what it was in 1990.
该镇的人口现在是1990年的三倍。
The team achieved a threefold growth in the number of users within six months.
团队在六个月内使用户数量增长到原来的三倍。
The company reported a threefold increase in profits.
该公司报告利润增长了三倍。
此处 threefold 作表语，表示‘有三重的’或‘三倍的’
The benefits of this approach are threefold.
这种方法的好处有三重。
Not this
The profit increased by threefold.
Use this
The profit increased threefold.
“threefold”用作副词时本身表示“三倍地”，因此不需要再用介词“by”。直接修饰动词即可。
Not this
The cost increased threefold times.
Use this
The cost increased threefold.
“threefold”已包含“三倍”之意，后面再加“times”造成语义重复。应去掉“times”或将“threefold”改为“three times”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
三倍的增长
The company reported a threefold increase in profits this year.
公司报告今年利润增长了三倍。
减少到三分之一
There has been a threefold reduction in the number of accidents since the new rules.
自新规定实施以来，事故数量减少到三分之一。
三重目的
The new program serves a threefold purpose.
新项目具有三重目的。
三重划分
The book follows a threefold division into history, theory, and practice.
这本书按历史、理论和实践分成三部分。
三重好处
The plan offers a threefold benefit: saving time, money, and energy.
这个计划有三大好处：省时、省钱、省力。
三重性质
The threefold nature of the problem requires a multidisciplinary approach.
这个问题具有三重性，需要多学科的方法。
三股合成的绳子不容易折断。
The phrase 'threefold cord' from Ecclesiastes symbolizes a strong bond that is hard to break.
这句出自《传道书》的“三股合成的绳子”象征着难以破坏的牢固纽带。
Use threefold naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆：three（三）+ fold（折叠），像把纸折三折变成三层，意为三倍。
语域：formal 常见场景：formal reports、academic writing threefold 作形容词时多用于正式或书面语境，如在报告和学术文章中表示“三倍的”；日常口语中通常更常说 three times。
常用作定语，修饰表示数量或程度的抽象名词，如 increase, reduction 等。
Dictionary facts from ECDICT, WIKTIONARY.