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Backyard roller coaster Roller coasters,Website:http://www.hlsino.com, as the classic amusement park equipment, are the most popular and commonly seen in the amusement parks, carnivals, funfairs, theme parks, indoor and outdoor playground, backyard, school, and so on. Backyard roller coaster is one of the very welcomed roller coasters with medium size and passengers on it have lower thrilling feelings, which is suitable for small children and their family to interact with each other in their