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.
换句话说，中国游艇产业过去之所以规模有限，并不是因为制造能力不足，而是因为需求土壤尚未形成。
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