overly optimistic; easygoing; irresponsible; naive; simple-minded

the Tangut language

Alternative form of 夏の大三角形

a female given name

the Tangut script (a logographic writing system used for writing the Tangut language of the Western Xia Dynasty)

There is a claw in 瓜 (“melon”) but no claw in 爪 (“claw”): A phrase explaining the difference between the characters 瓜 (“melon”) and 爪 (“claw”).

“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

(uranography) Summer Triangle - a bright asterism of the northern summer sky. Its corners are the stars Altair, Deneb, and Vega.

highly-skilled men are the first to be exhausted