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USB has been widely used in our daily life but we ignored its imperfection which we have always been putting up with it.The rectangle-connector of USB makes it difficult to tell the right side.That changing the re rectangle-connector into trapezoid-connector makes it easy to recognize the right side visually and avoids the user trying both sides to plug the USB in.The design improved can also protect the connect of the USB and computer,and at the same time,save the userstime
Yang Jun Luo Guan Zhou Caiqing He Jing