Life support systems utilizing plants to provide breathable air and nutritional sustenance function more naturally and would be less complex in a biosphere with AG. Since plants evolved on Earth to develop gravitropism with roots growing down relative to a gravity vector and shoots sprouting upward, ...
资料说明案例24the art of paper cutting剪纸艺术p129.docx,TheArtofPa p The Art of Pa p e r C u t t i ng TheArtofPa p e r C u t t i The Art of Pa p e r C u t t i ng H e n ya M e lichson ContentsIntroductionPaper Cutting Around the WorldTools and Materials68