[Double-passing door + industrial revolution + Datang infrastructure + time and space supply]
Dude, you picked up a little princess from the Tang Dynasty and she said her father was Li Shimin. What would you do?
Zhu Qian: Let's pamper her like my younger sister. What else can I do?
As a result, one day, he discovered that he could really open a space door - opposite was the city of Chang'an where Zhenguan was ten years old.
Good guy, can't this be arranged?
In modern times during the day: working on steel, pulling cables, moving machine tools, buying milk tea, mobile phones, and skirts for my sister;
Return to Datang in the evening: build blast furnaces, lay railways, make firecrackers, and help my sister and her father with infrastructure, industry, and revolution.
Li Shimin looked at the concrete roads and steam locomotives falling from the sky, his hands shaking: "My dear nephew... How many of these can we make?"
Zhu Qian hugged his sister who was watching the fun next to him and smiled slightly:
"Your Majesty, let's set a small goal first - let the Tang Dynasty enter the industrial age a thousand years ahead of schedule."
"By the way, let the whole world know - my sister, no one can bully her."
At the same time, China in the real world quietly stood on top of the world because of this "time and space supply" that spanned time and space.