The iron frame looks like iron, but compared to the wood of this era.

That's a lot lighter!

The wooden frame is solid, and the wood used is a heavy wooden square to prevent breakage.

To achieve the sturdiness of the iron frame.

The weight of a single wooden beam is scary enough.

And in this era, the ancient people had not yet invented the process of refining iron.

......

Chapter 788 of "The Silly Prince of Zhenguo" Want to use a beauty trick for this king again? I am hitting it in my hand, please wait a moment,

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