the mainland (as opposed to outlying territories)

main or trunk line, such as a railroad line or electrical line

main or flagship shop, store, or branch / this shop or branch

picture book

Alternative form of イヤホン

earphone

one's inherent nature

the main object of attention or affection (often used sarcastically) / the idol or other main object of worship at a temple

phon (unit of loudness)

adaptation