Hi there! I was in Shenzhen earlier this year. Your underground train station at Luo Hu was surprisingly easy to navigate even though I speak only the barest minimum of Mandarin, and can't read it at all.
I got a train there about 3 or 4 stops and went to one of your multi-storey electronic parts buildings. Very interesting. If I had more time there I'm sure I would have returned with reels and reels of components