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When pencils are used and become short pencils in daily life, people would throw them away. This
would result in the waste of resources, and this is also why I designed this “ folding cap of a pen “ to focus on this problem. When an original pencil becomes shorter and shorter, people could pull the
cap of a pen and put it on the top of a short pencil. Therefore, a short pencil still works and people
could start mass production. In addition, pen caps can be compressed when they are not in use.
Shuo LI ,
Shankai Tu ,