Definition: a coloured liquid that you use for writing, printing, or drawing Level: B1
请用墨水书写，不要用铅笔。
Please write ___in ___ink, not in pencil.
这本书是用三种不同颜色的墨水印刷的。
The book is printed in three different coloured ___inks.
一些秘密信息是用隐形墨水书写的。
Some secret messages are written with ___invisible ___ink.
