For centuries, fireworks have been used to mark major events around the world: the births of nations, weddings, birthdays, funerals and New Year's celebrations.
원문출처 : https://www.cnn.com/style/article/watch-how-a-firework-is-made/index.html
원문출처 : https://www.cnn.com/style/article/watch-how-a-firework-is-made/index.html