There are also various functions, such as being used as a water storage device in the wild, such as being used as a waterproof device for underwater operation of some electronic products, as well as entertainment purposes such as blowing balloons or loading coke+mentos, which are the sources of many funny ideas. Bill Gates also offered a reward of 50w meters for developing new condoms. Wait, isn't it too easy to expand each of these aspects by 800?