Practical tools, such as translating konjac, doctor's handbag, air cannon, bamboo dragonfly, etc. You can find substitutes in real life, but the props of Doraemon are particularly convenient and fast. For example, rich people can hire simultaneous translators, but ordinary people certainly can't. Just eat a konjac at this time. So the key is whether it can be mass-produced. If it can be mass-produced (well, props can be mass-produced), then not only Daxiong will make a profit, but it will also cause a devastating blow to many large companies with similar products.