名词
中文翻译：双头
同义词：
['dual', 'dualistic']
例句：
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1.The two books are about the same length and have similar content.
这两本书的长度差不多，内容也相似。
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2.The company has a dual purpose: to make money and to improve society.
这家公司有两个目的：赚钱和改善社会。
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3.He is a dual role model for students: both a teacher and a mentor.
他对学生既是老师又是导师的双重角色。