墨盒里墨水量少时打印作业会有空白区出现，请及时添加墨水。
Please add ink in time when there is blank area in print job for low ink .
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；
When the pen is used, people can clearly see the residual ink in the pen from the transparent ink bag, which is convenient for people to supplement ink at the right time.
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