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.
在那防水的小囊里，藏有一张细心卷起的上等薄纸，这张特殊的纸片上，用墨水写着各种各样的数字和密码字符。
Inside the waterproof capsule was a carefully rolled strip of the finest tissue paper. On this special paper, many figures and coded words were written in ink.
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