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        "quote": "类型为 (0, 1) 的四维张量称为 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:b6446ff8-b20d-4aef-b0ae-fccd4af25b48\" data-concept-route=\"/concept-identities#concept-b6446ff8-b20d-4aef-b0ae-fccd4af25b48\" id=\"first-5b128fd930d05c2229b2-zh\">四维余向量(4-covector)</u>，而类型为 (0, 0) 的四维张量将被称为 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:184255fe-e4dd-40ca-a6b9-ec43b3eb54f1\" data-concept-route=\"/concept-identities#concept-184255fe-e4dd-40ca-a6b9-ec43b3eb54f1\" id=\"first-5b2bf690504e62558aa1-zh\">四维标量(4-scalar)</u>，或简称为标量。关于四维张量，与一般张量一样，重要之处在于：如果一个四维张量方程能够被证明在某一特定参考系中成立，那么它在所有参考系中都成立。这是分量齐次变换律的直接推论。",
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