1.Before Milnor, no one had any inkling that this restriction made any difference; for spaces of three dimensions or fewer, it does not.
在米尔诺尔之前，没有人认为这个限制有什么影响；而对于三维以下的空间，确实没有影响。
2.Milnor is also known as a great expositor, whose books are low on abstruseness and high on simple, common-sense explanations.
米尔诺尔也是一个伟大的解说者，他的书不会很深奥，更多的是简单、常识性的解读。
3.J. Milnor Topology from a differential point of view
从微分观点看拓扑