名词
中文翻译：脑力劳动
同义词：
['mental effort', 'intellectual effort']
例句：
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1.The scientist spent a lot of brain effort on the experiment.
这位科学家在实验上投入了大量的脑力。
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2. The writer spent many hours brain-storming ideas for her next book.
这位作家花费了数小时为她的下一本书构思想法。
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3. The teacher believes that students should put in more brain effort to improve their academic performance.
老师认为学生应该投入更多的脑力来提高他们的学习成绩。