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"The four basic mechanical principles are Free Body Diagram, Equilibrium of Forces, Displacement Compatibility, and Stress-Strain or Force to Displacement Relations." Shi Tian answered the question in a textbook perfect form. 

However, Isaac Aaronax wasn't impressed by the answer and lamented. 

"Nathan, I'm not just asking what the four basic mechanical principles are, but how they are utilized." He said calmly. 

"I never said I was finished, Master Isaac." Shi Tian smiled calmly and placed his left hand on his right shoulder. 

A few seconds later, Shi Tian detached the mechanical right arm. Since the mechanical right arm was linked with his body, it would only take a thought process to detach the arm away. 

He then placed the mechanical right arm on the desk and began explaining the first principle.