Green: Same actor
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」，推荐阅读WPS官方版本下载获取更多信息
Having large sections of the crowd looking at their phones, not at the action on the pitch, could undermine that. There's a balance to be struck, he says.。Line官方版本下载对此有专业解读
By signing up, you agree to receive recurring automated SMS marketing messages from Mashable Deals at the number provided. Msg and data rates may apply. Up to 2 messages/day. Reply STOP to opt out, HELP for help. Consent is not a condition of purchase. See our Privacy Policy and Terms of Use.。关于这个话题，heLLoword翻译官方下载提供了深入分析