To work hard and persevere through difficulties and hardships.
不怕艰难困苦，坚持英勇斗争。
陶铸《崇高的理想》我们要过渡到共产主义社会，还要经过长时期的艰苦奋斗。”
Through years of jiankufendou, the startup eventually became a market leader.
Learn the next connected idiom: 艰苦奋斗 (jiān kǔ fèn dòu) → 斗志昂扬 (dòu zhì áng yáng)
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