To be diligent and vigilant day and night; to work assiduously and be constantly on guard.
他始终昼乾夕惕，对研究工作一丝不苟，最终取得了突破性进展。
He was always diligent and vigilant day and night, meticulous in his research work, and finally achieved a breakthrough.
Era:
Ancient
Frequency:
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