bù duì / lǐ / de / jiān kǔ / xùn liàn / ràng / zhè xiē / nián qīng rén / bǎi liàn chéng gāng / yì zhì / gèng jiā / jiān dìng

部队里的艰苦训练让这些年轻人百炼成钢，意志更加坚定。

The tough training in the army tempered these young people into steel and made their will even stronger.