• 1. a dull mind: 迟钝的头脑 | 反应迟钝的头脑乏味的
• 2. a dull pupil class mind: 迟钝的学生

• 1.A dull mind, an indifferent mind, is not aware.
  迟钝、淡漠的心意不是觉察。
  dict.yoduao.com
• 2.Questions keep your mind engaged. They can change your learning process from something dull to a treasure hunt.
  问题可以让你的大脑时刻参与，问题可以让你的学习过程从无聊变为寻宝之旅。
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• 3.And to the brain, a dry, dull, academic explanation is definitely CRAP (regardless of how much your mind CARES about the topic).
  对大脑来说，一个枯燥无味的迂腐解释绝对就是垃圾(无论你心里多么关心这个话题)。
  dict.yoduao.com

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