They used strings previously treated with powdered glass.
他们使用

用玻璃粉末处理过的绳子。
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I would not be surprised if you wondered about the part that suggestion might play in such a demonstration.I spoke of a demonstration without mentioning what sort of a demonstration.Before the fact, I mentioned no apparitions.
如果你们想知道在这样的示范中,暗示可能扮演的角色,我不会感到惊讶。我提到了示范,但没有提到是什么样的示范。事
我没有提到幽灵。
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