Leung Chun-ying: Shenzhen's changes in the past 'unprecedented'

Former Hong Kong chief executive Leung Chun-ying visited Shenzhen 40 years ago as a professional surveyor. He said he's witnessed what he calls "unprecedented changes" in the city, during his interview with CGTN reporter Zhu Dan to discuss how ties between Hong Kong and Shenzhen have developed since then.