To entrust someone with a crucial and challenging task or responsibility; to assign a significant and difficult mission.
项目负责人决定遗大投艰，将这个开创性的研究任务交给了团队中最有潜力的年轻成员。
The project leader decided to entrust the groundbreaking research task, a great and arduous mission, to the most promising young member of the team.
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