lifeless
Interpretation refers to writing tools.
The book "Yujiao Pear" in the Qing Dynasty dates back to 16: "Just ask your family to distribute the ink, pens, paper and inkstones they brought to everyone and write poems."
Structural combination
Usage as subject and object; Writing instrument
Synonyms are Four Treasures of the Study, Four Seasons of Learning and Four Things of Learning.
For example, Zhou Zuoren's About Paper: "Although I write with a brush, I have to have a pen, ink, paper and inkstone as usual."