研习自：[url=https://www.bilibili.com/video/BV1ZW4y1t7VV/?spm_id_from=333.337.search-card.all.click&vd_source=edcad05029f6d4b15eaba8a422397416]【GGB教学】（指令）折线图8-绘制正方体_哔哩哔哩_bilibili[br][/url][br][url=https://www.bilibili.com/video/BV1yW4y1q7AQ/]【GGB教学】（指令）折线图12-绘制正方体的正投影_哔哩哔哩_bilibili[/url]