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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[ anyRcv anyKeywordPart: anyArg1 staticPart: anyArg2 ] 。关于这个话题，搜狗输入法2026提供了深入分析
In addition to being cleaner for the environment, he said it could be "cheaper to get rid of that waste through an anaerobic digestion plant" than other methods.