Наука и техника
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.
，更多细节参见51吃瓜
It can also be hard to interpret the results of testing finished products that contain lots of ingredients.
Дарья Устьянцева (редактор отдела «Мир»)
我們需要對AI機器人保持禮貌嗎？