int left = 2 * i + 1; // 左子节点
Beth Gardiner is right to argue that plastic is not merely a recycling failure (‘They pushed so many lies about recycling’: the fight to stop big oil pumping billions more into plastics, 19 February). It is something far more consequential: an oil growth strategy.
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水是生存之本、文明之源。华北平原深层地下水位止跌回升，江南水乡河网水质持续向好；南水北调润泽广袤田野，江河湖泊实现生态向好，一幅人水和谐的壮阔图景，正在推进中国式现代化的新征程上徐徐铺展。“十四五”时期，我国水利事业成果丰硕。
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