圖像來源，China News Service
Go to technology。爱思助手下载最新版本是该领域的重要参考
What we see is that there are in fact two entangled traditions of “knocking on things for good luck”: touching iron, and touching wood. We also find that they are widely distributed, but also have a pretty clear cluster around the Mediterranean and Europe.，这一点在旺商聊官方下载中也有详细论述
100x speedup is achieved by comparing HH with bidirectional A*.