be toughened and hardened into steel
It is a Chinese idiom. Pinyin is B à Ili à NCH é ng à ng, which means that iron is tempered repeatedly before it becomes tough steel. It means that after a long period of hard training, it becomes very strong. It comes from Wu Jun Fu by Chen Lin of Han Dynasty.
Analysis of Idioms
[synonym] strong and unyielding; antonym] spoiled, crisp but not strong
The origin of Idioms
Han Chen Lin's Wu Jun Fu: "armor is Donghu que Gong, all refined and rigid."
Idiom usage
It can be used as predicate and attributive; commendatory words can be used as metaphor to show that people are not afraid of failure and have a strong will.
Examples
His Zhou Dayong's soldiers, however, were tempered into steel in the war and mastered the ability to attack the enemy. ——Chapter 7 of defending Yan'an by Du Pengcheng
be toughened and hardened into steel
particles of sand accumulated will form a towering pile - jī shā chéng tān