To work diligently from early morning until late at night; to toil from dawn till dusk, indicating tireless effort.
为了能让新品顺利上市，研发团队夜以继日，起早摸黑地攻克技术难题。
To ensure the new product could be launched on schedule, the R&D team worked tirelessly day and night, from early morning till late at night, to overcome technical challenges.
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