Bionic design studies take "shape", "color", "tone", "function", "structure", etc. of everything in nature as research objects, and selectively apply these characteristic principles in the design process, combined with the study of bionics The results provide new ideas for design. New principles, new methods and new approaches. Among them, the main graduate students of structural bionic design studies of the internal structural principles of the existence of objects and natural substances in design apply to product design and apply to product design and architectural design. According to the above definitions, Which of the following are structural bionic designs:. ['The designer invented the submarine based on the principle of the fish.', 'Scientists have created an electronic fish trap that mimics the sound of fish.', 'Inspired by the chameleon, the military designed camouflage clothing suitable for field operations.', 'Our ancestors had nests inspired by birds nesting in trees and inventing "nests" to defend against beast attacks.']