Chengdu is known as a city of parks. The capital of southwest China's Sichuan Province has more than 1,000 ecological parks, and one of them has made a name for itself as a "mosquito-free" green space. CGTN reporter Zheng Songwu visits the park to find out whether visitors can be exempted from any annoying mosquito bites and what magic the park does to control the population of the tiny insect.