foundation, Find me at the bottom of a structure!, posts, Vertical part of frame, beams, Horizontal part of frame, frame, Just like a skeleton\!, triangle, Very strong shape, arch, Strong Form that looks like "U" upside down, dome, Rounded form, natural, Made by animals, manmade, Human creation, purpose, What am i used for?, materials, What am I made of?

Structures

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恢復自動保存: ?