hows and whys
The first and last reason is an idiom, pronounced sh ǐ m ò Yu á NY ó u, which means "the course and cause of things", also known as "the first and last reason".
interpretation
The whole story: the whole story. Cause: the cause. What happened and why. It is also called "the beginning and the end".
source
In Yuan Dynasty, Ma Zhiyuan's Qingshan tears, the fourth fold: "you should not deceive Yin, but tell us the whole story in detail."
Examples
The ninth chapter of Chen Lang's snow moon plum in Qing Dynasty: "where does this daughter-in-law dare to hide, she has to tell the whole story straight."
hows and whys
Rise in the morning and fall in the evening - zhāo shēng mù gě
The road is high and the devil is heavy - dào gāo mó zhòng
layer upon layer of peaks and knolls - céng luán dié zhàng
move forward , or you 'll fall behind - bù jìn zé tuì