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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.，这一点在51吃瓜中也有详细论述
Why the FT?See why over a million readers pay to read the Financial Times.，更多细节参见夫子
line_quality: “mixed sharp and soft”。快连下载安装是该领域的重要参考