The children were letting off fireworks.
孩子们在放焰火。The celebration of Chinese New Year used to include a display of fireworks.
过去中国新年庆典包括放焰火。
AGENCY'S ACTIONS SET OFF FIREWORKS
The Analysis of Characteristics of PM_(2.5) Components during Set-Off Fireworks Period of Spring Festival in Suzhou City
Black hole collision may have set off fireworks in the Milky Way
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The Last Was The Toughest No. 3,000 for Carl Yastrzemski was only a ground ball, but it set off fireworks
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Vandals Set off Fireworks under City Firefighter's Car on Northeast Street
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Resident loses bid to set off fireworks on July Fourth ; Board won't issue permit, cites neighbors' opposition