Ni hao! Mei wenti.
I know Shenzhen quite well actually. I was dealing with factories there, Donguan, and the whole SEZ. I would take the train, walk over the borders, etc, sometimes I would take the ferry from Hong Kong. I miss that part of my life terribly but my family needed me at home more that 50% of the year. Being a USA PNW'er - anytime from May - Oct seemed way too hot for me. Winter was great - I never needed a jacket, but all the girls were freezing at night.