夜晚的数小时学习会让你第二天感到疲劳而且大脑不灵光。
Studying for hours the night before will make you tired and your brain won't work well.
刚踏入社会工作时，因为英语不灵光，我时常不能有效地和同事交换意见。
Needless to say, I had problems communicating effectively with my colleagues in English when I began working.
哈里·哈萨奇安从事睡袋生意，他的公司在中国生产睡袋，然后通过海路运到美国销售。但最近，他发现这个数学模式不灵光了。
Harry Kazazian built his business on sleeping bags made in China and shipped across the ocean to the United States, but he realized recently that the math no longer works.
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