The UK government has been investing heavily in renewable energy in its bid to meet 95% of electricity demand with clean power by 2030.
Photograph: Julian Chokkattu
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」，推荐阅读搜狗输入法下载获取更多信息
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Жители Санкт-Петербурга устроили «крысогон»17:52