朋友们你们好啊我是新来的

阿苏

大家好，我是刚来到百度贴吧的一个墨西哥人，我是一月来到中国的，听说这里是全中国最好的异性交友交流平台，我不会中文，正在用谷歌翻译器翻译，最近刚垂直入坑了百度贴吧，希望我们能够成为朋友
Hello everyone, I am a Mexican who just arrived at Baidu Tieba. I came to China in January and I heard that this is the best platform for opposite sex dating and communication in China. I don't know Chinese and am currently using Google Translate to translate. Recently, I joined Baidu Tieba and hope we can become friends

阿苏

+3是中国的什么习俗吗？