He had persuaded his science teacher to help him make a makeshift rocket. Somehow, he had managed to get his hands on the ingredients for gunpowder - potassium nitrate, sulphur and charcoal.
这种 “把鸡蛋放一个篮子里” 的玩法，在政策和竞争的双重冲击下，注定不堪一击。
。关于这个话题，51吃瓜提供了深入分析
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