3. 数学之美：参数化几何体与克莱因瓶
• Every time I teach world history, I make a point of showing things like the above to my students and reading them Philip Larkin’s “An Arundel Tomb”:
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Time has transfigured them into
"For a long time, roboticists have used DC [direct current] motors to make robots move," says Mike Tolley at the University of California San Diego.
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