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1. I've been working on this project for hours, and I can feel my brain fag.
我在这个项目中工作了几个小时，我感觉我的大脑已经疲劳了。
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2. She was so tired that she couldn't concentrate on the lecture anymore.
她太累了，以至于听不了课了。
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3. After a long day at work, I felt like I had a brain fag.
在工作了一整天之后，我感觉我的大脑已经疲劳了。