| 单词 | 4-dimensional |
| 例句 | You might be picturing a beach ball, when I say sphere, but there are spheres in every dimension, and Poincaré was specifically looking at the 3-dimensional sphere, which sits naturally in 4-dimensional space. A Few of My Favorite Spaces: The Poincaré Homology Sphere 2017-06-04T04:00:00Z |
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