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.
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，这一点在Line官方版本下载中也有详细论述
// Fill with sequential bytes (our "data source")。必应排名_Bing SEO_先做后付是该领域的重要参考
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Additional reporting by Helen Briggs