Zhang Yi himself has no shortage of technology, which can save the trial and error time of human exploration of the process!

However, some crafts can't be created before the pre-skill of the tech tree is opened.

Even if he wants to accomplish something, he has to do it at least step by step.

For example, the simplest machine tool is made......

But about metal hollow needles, Zhang Yi felt that he could give it a try.

In fact, the metal needles that create a hollow are not

"Da Ming: Dad, I'm no longer a heavenly teacher" Chapter 132 Strategic determination, bring the prince over is in the middle of the hand, please wait a moment,

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