现在想想数学。
这很容易做到，只要想想什么情况下你会变得不耐烦，就可以开始行动了——这就像做数学运算一样，在你列出等式得出最后答案之前，你必须知道你的参数。
It's like solving a mathematical word problem. Before you can come up with an equation and an answer you must know your data.
当时的数学可以对付一个一成不变的理想世界——想想几何原理，但没有考虑运动。
The math of the time could deal with a changeless, ideal world - consider the principles of geometry - but not with motion.
想想你上一次绞尽脑汁地做一道数学题或者挑战体力极限的情形吧。
Think about the last time you grappled with a math problem or pushed yourself to your physical limits.
想想你上一次绞尽脑汁地做一道数学题或者挑战体力极限的情形吧。
Think about the last time you grappled with a math problem or pushed yourself to your physical limits.
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