To devote all one's care and effort; to spare no effort and dedicate oneself wholeheartedly; to exert oneself to the utmost with great diligence.
为了顺利完成这项复杂的项目，团队成员们悉心竭力，日夜兼程，最终取得了圆满的成功。
To successfully complete this complex project, the team members devoted all their care and effort, working day and night, and finally achieved complete success.
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