tutorial资讯

Starts of MLB team names - BLUE, BREW, CARD, ROCK

// Producers are supposed to wait for the writer.ready，更多细节参见同城约会

stack.pop(); // 弹出无效候选值，详情可参考一键获取谷歌浏览器下载

Beta 通道规则调整：若用户四个月未安装任何测试版，系统将自动切回公开版更新通道；