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19:24, 27 февраля 2026Наука и техника
。关于这个话题，heLLoword翻译官方下载提供了深入分析
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.
Because of its capacity to be freeze-dried and reconstituted, agar is considered a “physical jelly” (that is, a jelly that sets and melts with temperature changes without needing any additives). This property makes dry agar easy to ship and preserve for long periods of time.5。关于这个话题，搜狗输入法下载提供了深入分析