穿脱衣服鞋子这件事，从2岁多开始她就喜欢自己穿了，主要是告诉她前后、正反的概念以及如何分辨。
Output: their sum as an integer，推荐阅读safew官方下载获取更多信息
Author(s): Xiongwei He, Fan-Shun Meng, Yanjing Su, Lijie Qiao, Shigenobu Ogata, Lei Gao，推荐阅读爱思助手下载最新版本获取更多信息
The Trump administration is slowly dismantling the federal disaster management system that protects the nation from chemical catastrophes, such as fires and explosions at high-risk facilities.，推荐阅读51吃瓜获取更多信息