夜以继日

• ピンイン: yè yǐ jì rì
• 漢字の分解: 夜 = night; 以 = using/by means of (classical particle indicating continuation); 继 = 糸 (thread — continuity; following without interruption); 日 = sun/day — night seamlessly followed by day in an unbroken chain

意味

昼夜を問わず休まず働く

Derived from classical Chinese, literally meaning 'night followed by day' — implying such relentless continuity that night seamlessly gives way to day and day gives way to night without rest. Used to praise dedication and perseverance in difficult tasks, especially sustained efforts in work, study, rescue operations, or national projects. Can imply both admirable commitment and physical exhaustion.

例文

1. 救援队在废墟中夜以继日地挖掘搜寻，连续奋战七十二小时后终于将最后一名被困者从倒塌的楼板下救出。
2. 那段时间他夜以继日地赶写论文，眼中的血丝和憔悴的面容让同学们都替他担忧不已。
3. 工程师们夜以继日地攻克技术难题，终于在截止日期前完成了核心模块的开发和测试工作。

使い方ガイド

場面: work, study, rescue, national projects, literature

トーン: positive

正しい言い方

• 洪灾来袭，工程师和救灾人员夜以继日守在大堤一线，筑起防洪屏障，保住了下游数十万居民的家园。(When the flood struck, engineers and rescue workers worked night and day on the embankment frontline, building flood barriers that protected the homes of hundreds of thousands of downstream residents.)
• 这套系统的核心代码由不足二十人的团队夜以继日打磨近两年，关键模块多轮测试后，稳定性远超竞品。(The core code of this system was polished night and day for nearly two years by a team of fewer than twenty people, and after multiple rounds of testing, its stability far exceeded that of competing products.)

避ける言い方

• 他夜以继日地看电视 — 夜以继日 is reserved for earnest, goal-oriented effort; applying it to leisure activities like watching television creates a comic or ironic effect; say 他整天泡在电视前 or 他没日没夜地刷剧 for casual binge-watching; 夜以继日 carries connotations of dedication to a serious purpose

起源と歴史

夜 (night) + 以 (using/with — a classical particle linking means to action) + 继 (continue/follow without break — 糸 thread; connecting one thing to the next) + 日 (day/sun)

文化的背景

時代: Classical/Modern

世代: All ages

社会的背景: Universal