“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

Traditional Chinese (Chinese written using traditional characters)

Simplified Chinese (Chinese written using simplified characters)

a parallelogram

round the clock / all the time

the twenty-four divisions of the solar year / the twenty-four terms used to denote the changing of the seasons

(idiomatic) four treasures of the study: the brush, ink, paper and inkstone used in Chinese and other East Asian calligraphic traditions

a quadriceps femoris muscle

a cackling goose

(mathematics) quartile