dual all integer

例句：

1. 1. The design of the building features a dual entrance.
   这座建筑的设计有一个双入口。
2. 2. The company has implemented a dual system for managing its resources.
   该公司实施了一个双重系统来管理其资源。
3. 3. The dual nature of this problem makes it challenging to solve.
   这个问题的双重性质使得解决它很有挑战性。