astute on petty things
It is clear that the Chinese idiom, Pinyin is ch á ch á w é im í ng, which means to describe being shrewd in details. It is also used to describe people who are critical of small things. It comes from the biography of huangfumi in the book of Jin.
The origin of Idioms
The biography of Huangfu MI in the book of Jin: "if you want to be warm and smooth, you don't want to be observant and clear."
Analysis of Idioms
The synonym can be seen clearly
Idiom usage
He happened to meet a governor of the two rivers. He was most pleased to hear that he didn't know how to drive, so he had to make an investigation in person. (Chapter 78 of Wu Jianren's twenty years of witnessing the strange situation in Qing Dynasty)
astute on petty things
the source is distant and the stream long - yuán yuǎn liú cháng
particles of sand accumulated will form a towering pile - jī shā chéng tān