(archaic) second-person personal pronoun: you

(literary) member

inevitably, certainly

櫃: chest, coffer

加筆: revision

加筆: revise

setting fire

need, necessity / essential

key, important point / essential piece of something, requirement

the pin or rivet holding the spines of a folding fan together / (by extension) a pivot, cornerstone, keystone / a pin, often decorated, holding the handle to the tang of a katana