the Paleogene period

Inner Mongolia (an autonomous region of China)

Outer Mongolia

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

Ancient Greek language

Alternative form of 古代教会スラヴ語 (Kodai Kyōkai Suravu-go, “Old Church Slavonic”)

Old Church Slavonic

“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

Simplified Chinese (Chinese written using simplified characters)

Traditional Chinese (Chinese written using traditional characters)