To describe a person, typically a leader or scholar, who is exceptionally diligent and dedicated to their duties, handling a vast amount of work with meticulous care; implies immense effort and a heavy workload.
这位研究员在资料室里，每日衡石程书，不知疲倦地整理着大量的历史文献。
This researcher, in the archives, works with immense diligence every day, tirelessly organizing a vast amount of historical documents.
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