ㄐㄧㄢㄎㄨˇㄓㄨㄛˊㄐㄩㄝˊjiānkǔ‑zhuójué

坚苦卓绝
  1. 堅毅刻苦精神超越常人 飽嚐風霜堅苦卓絕」。

persisting despite trials and tribulations (idiom)​; conspicuous determination