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        "quote": "参数曲线$\\sigma$在$p$处称为类时、类空或类光，如果其在$p$处的切4-向量分别为类时、类空或类光。假设物质粒子的路径在其经过的所有事件处均为类时，并且常被称为该粒子的<u class=\"concept-term\" data-concept-identity=\"urn:uuid:0f98d8d9-386f-44fc-b786-2c81bdb50d6e\" data-concept-route=\"/concept-identities#concept-0f98d8d9-386f-44fc-b786-2c81bdb50d6e\" id=\"first-5d5ac951d2864fd33092-zh\">世界线(world-line)</u>（见图9.2）。这一假设等价于要求粒子的速度始终小于$c$，因为",
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