The second boy is mainly in charge of the overall situation, and he doesn't know much about some subtle things, which is also very in line with the identity of the housekeeper.

"That's the young master, you see that there are so many threads on this little thing, what is this for? How can it be manufactured? ”

"There is also this round thing, I see that the young master's drawings are deliberately marked......

"Saving the Ming Empire from the Son-in-law" Chapter 260 Making a Mechanical Compound Bow is in the middle of the hand, please wait for a while,

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