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As we all know it is difficult to thread a needle, then there is no other way to place it? This design helps people to use other means to conduct sewing instead of an ordinary needle. After the study, we found that some liquid can be rapidly solidified into a solid when encountered with air. At first, people immersed line in the liquid. Then, pull the line out from the liquid. When the liquid on the line solidified into a needlelike solid, we get a substitute for needle. After use, people can cut the needle, and throw it away.