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Used when someone is bent on/wholeheartedly focused on/single-mindedly doing something
Neutral
他的父亲是一个工作狂，与人合伙经营一家家具店，父亲一门心思扑在工作上，没有时间照顾孩子 | Tā de fùqīn shì yīgè gōngzuò kuáng, yǔ rén héhuǒ jīngyíng yījiā jiājù diàn, fùqīn yīménxīnsī pū zài gōngzuò shàng, méiyǒu shíjiān zhàogù háizi
His father is a workaholic who has partnered with others to run a furniture shop. He focuses solely this work and has no time to care for the children
[Source]
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《重赏之下》(Chóng Shǎng Zhī Xià), a work by modern-day author 孙华炳 (Sūn Huá Bǐng)
This chengyu is from a line in the work listed in the "Origin" section above