"Hong Wu Leng smiled: "Liu Guang, don't bother. My hand is very stable. Even if you have big folds all over your forehead, I can still carve words on it for you!"(adsbygoogle = indo.adsbygoogle | | []..., "No, but the principle is pretty much the same. They are all metal detectors. They will give a reminder when they meet the metal underground, and the mines are also made of metal, so they can also m...