Day by day
The Chinese idiom, R ì Yu è y ú m à I in pinyin, means that the sun and the moon move forward, which means the passage of time. It comes from the book Qin Shi.
The origin of Idioms
"Book · Qin oath:" my heart's worry, day and month, Ruofu cloud to Kong yingdashu said, "the sun and the moon are moving fast, and they are all in the past."
Idiom usage
Used as an object or attribute; used of the passage of time. example with each passing day, prosperity and decline are promoted. --Zhang Shuo's preface to the inscription of Zen master Datong in Yuquan Temple of Tang Dynasty
Day by day
see evidence of people's distress everywhere - mǎn mù chuāng yí
steal the beams and pillars and replace them with rotten timbers - tōu liáng huàn zhù