* @param low 起始索引
"promptQueueUseCount": 0,
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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.
国雅大厦北侧立体停车设施效果图。该大厦紧邻首都儿研所。受访者供图