china wire tapping machine，china wire tapping machine，china wire tapping machine，china wire tapping machine，It was in the stands of Beijing's Bird's Nest stadium that David Brown's dreams of a career in track and field started to take hold.Brown, who has been blind since the age of 13, remembers taking in the "spots and colors" of the Paralympic Games in Beijing as his friends dictated what was happening down on the track."I'm like: 'Hey, some of these guys have the same sight that I do, it sounds like,'" Brown recalls to CNN Sport. "They're down there running and they're doing this ... and I'm like: 'Yo, this is possible. I can do this.'"That was in 2008, but fast-forward 13 years and Brown is now preparing to defend his crown in the 100-meter T11 event at the Paralympics in Tokyo.Aside from winning a Paralympic gold medal in 2016, the 28-year-old Brown also lays claim to being the first totally blind athlete to run under 11 seconds in the 100m with his classification record of 10.92 seconds.