fourfold

• 形容词，表示数量、程度或大小是原来的四倍；也指由四个部分或方面组成的。

An adjective meaning four times as great in size, amount, or number; comprising four parts or aspects.

1. Four times as great or manyB2formal

   Being four times the amount, size, or number of something.

   四倍

   • The company saw a fourfold increase in profits this quarter.
   • The population of the city has grown fourfold in the last decade.
   • The cost of the project was fourfold higher than initially estimated.

   同义词quadruplequadruplicate

2. Having four units or componentsB2formal

   Consisting of or divided into four parts, elements, or aspects.

   四部分的

   • The plan has a fourfold purpose: to educate, inspire, engage, and empower.
   • The problem requires a fourfold solution addressing each issue separately.
   • The classification system is fourfold, dividing the data into distinct categories.

   同义词quadruplequadruplicate

• 副词，表示“四倍”或“分成四份”。用于表示乘以四或分成四个相等的部分。形式与形容词相同，在英式英语和美式英语中都很常见。

An adverb meaning "by four times" or "in four parts." It is used to indicate multiplication by four or division into four equal parts. The form is identical to the adjective and is common in both British and American English.

1. By a factor of fourB2formal

   In a way that multiplies or increases something by four times.

   四倍地

   • The company's profits increased fourfold over the last year.
   • The population of the town has grown fourfold since 1990.
   • The cost of raw materials rose fourfold due to the shortage.