(idiomatic) four treasures of the study: the brush, ink, paper and inkstone used in Chinese and other East Asian calligraphic traditions

a study, an office

poem / verse of poetry / (poetry) Chinese poetry / Short for 詩経 (“Shijing, the Book of Odes”).

treasure

conjunctive form of 書く

to use / to employ / to make use of, to apply / to spend

write; record (words, figures) on the surface of (something) / compose; put (an idea, etc) into words

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend