To exhaust one's mind in deep thought and careful planning; to rack one's brains meticulously.
为了成功举办这次活动，项目组的成员们殚心积虑，制定了详细的方案。
To successfully host this event, the project team members racked their brains, developing a detailed plan.
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To exhaust one's mind in deep thought and careful planning; to rack one's brains meticulously.