名词
中文翻译：双重的
同义词：
['dual', 'dualistic', 'duplex']
例句：
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1. The company has a dual purpose: to make money and to help people.
这家公司有两个目的：赚钱和帮助人们。
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2. The dual role of the president is to lead and to serve.
总统的双重角色是领导和服务。
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3. The dual system of education in China is both effective and efficient.
中国的教育体系既有效又高效。