| 单词 | orthonormal tetrad |
| 释义 | orthonormal tetrad [¦ȯr·thǝ¦nȯr·mǝl `te´trad] RELATIVITY A collection of four mutually orthogonal unit vectors, three spacelike and one timelike, at a point of space-time, that specify the directions of the four axes of a locally Minkowskian coordinate system. |
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