Concept art for the project.
Soviet-era spacecraft 'likely' to have re-entered Earth's atmosphere
，详情可参考heLLoword翻译官方下载
// 最后一个非叶子节点索引: n/2 - 1，这一点在夫子中也有详细论述
pubmed.ncbi.nlm.nih.gov
prepared by tellers, but actually automate the handling of the checks