- double：例如 The price of this product has doubled in the past year.（这种产品的价格在过去一年里翻了一倍。）
- increase by 100%：如 The company's profits increased by 100% compared to last year.（这家公司的利润比去年翻了一倍。 ）
- be twice as much/many as：比如 The number of students this year is twice as many as that of last year.（今年的学生数量是去年的两倍，即翻了一倍）
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