When the pen is used, people can clearly see the residual ink in the pen from the transparentink bag, which is convenient for people to supplement ink at the right time.
使用时，透明的墨水囊可以让人们随时清 楚地了解笔内剩余的墨水量，便于人们在合适的时间补充墨水；
2
With the bottom of the projection of a white transparent container filled with water, then drip in the water the color ink or oil-based paint.
用一个装满水的白色透明容器的投影的底部，然后在水面点滴彩墨或油基的颜料。
3
A pixel is built by sandwiching a layer of P-Ink, along with a small amount of electrolytic fluid, between two transparent electrodes.