task : $6969$##What fundamental theories form the cornerstone of civil engineering, and how do they underpin the discipline's core principles and practices? Explore key concepts such as structural mechanics, fluid dynamics, and materials science, elucidating their roles in designing infrastructure, buildings, and transportation systems. Discuss the application of theoretical frameworks like Newton's laws of motion, Euler$-$Bernoulli beam theory, and Navier$-$Stokes equations in analyzing and predicting the behavior of civil structures. Additionally, delve into foundational principles such as load$-$bearing capacity, stress analysis, and sustainability, elucidating their significance in ensuring the safety, resilience, and longevity of civil engineering projects in a dynamic and evolving world.

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