dual

Having two parts, elements, or functions; combining two things.

• duality/djuːˈælɪti/(n)二元性；双重性
• dualism/ˈdjuːəlɪzəm/(n)二元论

• dual role
• dual purpose
• dual approach
• dual nationality
• dual function
• dual mandate

1. 1.She holds a dual role as both creative director and head of strategy, which gives her unusual influence in the organisation.
2. 2.The project serves a dual purpose: meeting regulatory requirements while also improving the customer experience.

• double/ˈdʌbəl/— having two of something
• twofold/ˈtuːfəʊld/— having two parts
• bilateral/baɪˈlætərəl/— involving two parties

from Latin "dualis," from "duo" (two)