"Question from @Eagle_force_555: How influential was UK's sovereignty transfer of Hong Kong on the Chinese economy since then? #AskJohnSimpsonJohn answers: HK highly influential on China, less on economy than politically. Cld be major influence in the future #AskJohnSimpson" BBC's John Simpson held an Q&A session about China on twitter, he ansewered many questions and this is one of them. (http://www.bbc.co.uk/news/world-23509233) Could you please tell me what "CId" stands for? Thank you.