One moment the professor is working hard on a problem in physics, the next he's gone off at a tangent and he's talking about bees.
前一分钟教授还在努力解答一道物理题，下一分钟他就突然开始讲起蜜蜂来。
One moment the professor is working hard on a problem in physics, the next he's gone off at a tangent and he's talking about bees.
前一分钟教授还在努力解答一道物理题，下一分钟他就突然开始讲起蜜蜂来。
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