task : $3\mathrm{.}20$#theories in civil engineering underpin the foundation of the discipline? Explore the fundamental principles and conceptual frameworks that shape civil engineering practice and research. Investigate how theories such as structural mechanics, fluid dynamics, soil mechanics, and materials science contribute to understanding and solving real$-$world civil engineering problems. Discuss the role of theoretical models in predicting the behavior of structures, designing infrastructure, and optimizing construction processes. Additionally, consider how advancements in computational methods and interdisciplinary approaches influence the development and application of theories in civil engineering, ensuring sustainability, resilience, and innovation in the built environment.