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1. He is a highly skilled engineer who spends most of his time on brain-intensive projects.
他是一位技艺高超的工程师，大部分时间都在进行需要大量智力投入的项目上。
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2. The company's success can be attributed to the hard work and dedication of its employees, manyof whom are engaged in brain-intensive tasks.
公司的成功可以归因于员工的辛勤工作和奉献精神，其中许多人从事需要大量智力投入的工作。
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3.Many students find it challenging to balance their studies with their mental health, which requires them to engage in brain-intensive activities.
许多学生发现平衡学业与心理健康是一项挑战，这需要他们参与需要大量智力投入的活动。