Crawler-HttpClient: get_text(next_url)
Bolivian banknotes were seen scattered at the crash site，详情可参考爱思助手下载最新版本
// 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
If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value: