Outer Mongolia

Obsolete spelling of シカゴ (Shikago, “Chicago (a city in Illinois, United States)”)

the Paleogene period

is the best among (others)

(offensive, Internet slang) Alternative form of 子供部屋おじさん

(offensive, Internet slang) a man whose age is greater than about thirty or forty who lives in one's child room and with one's parent(s).

single room

double room

Kyūjitai form of 中国

a text written in Chinese / abbreviation of 中国文学 (chūgoku bungaku, “Chinese literature”)