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.
露西·吉爾德（Lucy Gilder），BBC事實查核，更多细节参见旺商聊官方下载
，推荐阅读同城约会获取更多信息
Фото: Tatiana Meel / Reuters。业内人士推荐快连下载安装作为进阶阅读
习近平总书记微笑作答：“我是人民的勤务员。”
class CombinedStorage(Storage):