研究了塑料管式安全鞭炮的制备原理和制备工艺，分析了APC引燃剂的主要性能。
The preparation principle and techniques of plastics-tubing safety fireworks are introduced, and the main characteristics of APC is tested.
街道上安全部队戒备森严，确保传统节日火祭不会被反对派所利用。 伊朗人通常以跳跃篝火、燃放鞭炮的方式来庆祝这一节日。
Security forces flooded the streets to ensure that a traditional fire festival, which Iranians celebrate by jumping over bonfires and letting off crackers, would not be co-opted by the opposition.
现在很多城市都禁放烟花炮竹，因为不安全，尤其是小孩放鞭炮更加危险。
Now people in some cities are not allowed to set off firecrackers or fireworks because it's not safe to do that, especially for children.
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