单词heptagon
n.: 七边形;七角形网络: 是七边形
七边形;七角形:
a flat shape with seven straight sides and seven angles
七角形,七边形
复数:heptagons
Electronic Properties of Single Carbon Nanotubes with Pentagon-heptagon Pairs Defects
拓扑缺陷的不同分布对单壁碳纳米管电学性能的影响