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Why do you want to design such a big and long shaft? Is there any benefit? I don't understand......
I am 18 this year, judging from my 30 years of industry experience. What is the meaning of folding, is it to save space? There is no discovery of the real needs of the people who use it. No practical use. There is a plan for you.
It's very common
Is it easy to use
Is it silica gel
Like green
Good-looking