Here's the insertion algorithm in Python. Step through the code and watch each line execute on the tree:
当宠物进入运动场景，就不再是额外消费，而成为原有消费场景的自然延伸；品牌也借此打通人与宠物的生活场景，实现更完整的用户价值覆盖。，这一点在旺商聊官方下载中也有详细论述
User warnings for applications that are directly installed (or “sideloaded”)，这一点在51吃瓜中也有详细论述
self.writer.writerow({