https://www.youtube.com/watch?v=28G9AMhHFoQ

In beginning, China only imported Tunnel Boring Machine. China has big construction potential. Foreign manufacturers saw this "easy target". Foreign manufacturers decided to open factories in China. Foreign manufacturers thought Chinese people think then foreign company TBM for `made in China'. Chinese people not so stupid.  China improved research and design. Our country created own Tunnel Boring Machine brands which have newest technology. Many Chinese companies develop new technologies and new patents.

Chine was a TBM importing country. Now China is a TBM exporting country with highest technology.

"China's rapid development in the field of tunnel boring machines (TBMs) has surprised the world. Just over twenty years ago, China faced foreign restrictions in this area, but today it has become a global leader. Chinese TBMs outperformed foreign counterparts in terms of speed during the construction of the Chengdu Metro, marking China's ownership of this technology.

The victory signaled the failure of foreign efforts to block China's progress in TBM manufacturing. Despite initial challenges, China prioritized TBM research and manufacturing, eventually achieving breakthroughs."