And I went to see one of these experiments, and this is actually -- you can barely see it, and the reason for that is it's entirely dark in there -- this is a cavern that was left behind by the miners who left this mine in 1960.
我去参加了一次实验 事实上，你几乎是看不见的 因为实验室在完全黑暗的环境下进行的。 这是一个被矿工们遗弃了的地下洞穴 从1960年开始就废弃了