形容词
中文翻译：四倍的
同义词：
['four-fold', 'fourfold', 'fourfold']
例句：
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1.The company's profits have increased by fourfold since the new policy was implemented.
自从实施了新政策后，公司的盈利增加了四倍。
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2. The task requires a fourfold increase in efficiency.
这项任务需要效率提高四倍。
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3. The scientists discovered that the virus could mutate fourfold within a year.
科学家们发现，这种病毒在一年内可以变异四次。