Sharpen one's strength
Sharpening the bottom of the earth, pronounced m ó L ó NGD ǐ L ì, is a Chinese word, which means sharpening the bottom of the earth.
explain
1. It is also called "sharpening the bottom". Also known as "honing". 2. Four kinds of grindstones with different texture and color. 3. Sharpen and exercise.
source
Han Meicheng's Shangshu Jianwu Wang: according to the fact that it was not born, it was not formed at first, and it was tempered, but its damage was not seen, and sometimes it was exhausted.
In the history of Ming Dynasty, volume 164, biography of fan Jizhuan, he chose the folk children who were sincere in their sexual behavior as his apprentices We should sharpen it, make it full of determination, make it outstanding, and then use it, so as to make things easy for the country.
Sharpen one's strength
When the tiger comes out of its shell - hǔ sì chū xiá
be helpless and in the greatest straits - jì qióng lǜ jìn