I have seen an invention proposal before, saying that small soap heads are not easy to use, and it is not a waste to throw them away. Soap factories should add something to the core of soap to help use soap heads. However, many years have passed, and no manufacturer has accepted this proposal. Yes, that will cause another kind of material waste. How do you deal with soap?
Common sense of science and technology in the world: teaching you to make rational use of residual s
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