双鹰金元

例句：

1. 1. The double-edged sword of technology is a double-edged weapon that can be used for both good and evil.
   技术的双重性是一把双刃剑，既可以用于好也可以用于坏。
2. 2. The dual role of the president in this country is to serve as both a leader and a representative.
   总统在这个国家的双重角色是作为领导者和代表。
3. 3. The dual benefits of this new policy are both economic and social.
   这项新政策的双方面好处既有经济上的也有社会上的。