Ye Feng tapped it with his hand, it didn't look like metal, it didn't look like a stone, and it was smooth on it.

"Glass?"

So, he touched the whole place with his hand, and it really looked like a piece of glass.

"Was there glass in World War II?"

Ye Feng couldn't figure out when glass was invented, so he continued......

"Wandering on a desert island with the goddesses, I am the king!" Chapter 122: You're Not in the Same Gang as Them? I am hitting it in my hand, please wait a moment,

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