C1 with two parts, or combining two things两部分的;二元的;双重的
two sets of controls in a car, one for the person who is learning to drive and one for the teacher(教练汽车的)双重控制,复式操纵
the nationality of two countries at the same time双重国籍
More examples
Everything he says has a dual meaning.
Although she had the dual advantages of wealth and beauty, she did not have a happy life.
These painkillers have the dual strength of ibuprofen and codeine, for fast and effective relief.
A product with dual action - that kills bacteria and removes stains - is really the best.
The community hall was designed for dual use, by the school during school hours and by the public at other times.
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