Zhè wèi kēxuéjiā yǐ jiānrěn-bùbá de yìzhì, zài shāmò lǐ jiānchí yánjiū le sānshí nián.
With unshakable resolve, this scientist kept up his research in the desert for thirty years.
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The original form, from 苏轼's essay 《晁错论》, where 忍 "to endure" stresses patience under hardship. The variant 坚韧不拔, with 韧 "tough", is now more common, and both are standard.
