<p style="font-size: 12px;color:#aaa;">版权引用：<a href="https://www.behance.net/gallery/6912435/Sketch-Unplug-Product-Design-Sketch"><span style="font-size: 12px;color:black;">“After sketching in pencil, redraw the line by ink pen.Sketch unplug. All about traditional methods.​Mechanical pencil, prismacolor, ballpoint, marker, and pastel. p.s Most design sketches were original, and some of sketches were derived from certain books as for instruction references.    Materials”</span> </a>由 <a href="https://www.behance.net/zhunghsieh"><span style="font-size: 12px;color:black;">Zion Hsieh</span></a> 授权许可 <span><a href="https://creativecommons.org/licenses/by-nc-nd/4.0/deed.zh" target="_blank" style="font-size: 12px;color:black;">Attribution-NoDerivs-NonCommercial 4.0 International<img src="" style="display: inline-block;height: 16px;width: auto;"></a></span></p>