两国领导人就乌克兰危机交换意见。习近平阐述中方原则立场，指出关键是坚持通过对话谈判寻求解决方案。要确保各方平等参与，筑牢和平基础；确保照顾各方合理关切，增强和平意愿；确保实现共同安全，构建持久和平架构。
In 1986, the Challenger spacecraft suffered a catastrophic failure seconds after launching, killing all seven crew members on board.
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生成完成后，我们就可以直接使用这些实体类进行数据序列化和反序列化操作：
// 1. 建堆：从最后一个非叶子节点开始向上调整