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        "quote": "$\\mathbf { A } \\mathbf { s } r  2 m$ 度量在这些坐标中未显示出任何异常。在区域 $r > 2 m$ 中，向内指向的类时测地线在有限的 $v$ 时间内到达 $r = 2 m$（并且在有限的固有时内也是如此）。然而，当测地线粒子穿过 $r = 2 m$ 之后，无法从它向 $r > 2 m$ 发送任何光信号（见图 18.4）。曲面 $r$ 2$m$ 对光信号而言充当单向膜，称为 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:9c94cffc-a155-4a23-9c2f-298515ef4d50\" data-concept-route=\"/concept-identities#concept-9c94cffc-a155-4a23-9c2f-298515ef4d50\" id=\"first-aae3a818b4ab5afa13ff-zh\">事件视界(event horizon)</u>。具有 $r > 2 m$ 的观测者永远无法看到 $r = 2 m$ 内部的任何事件，这种效应通常被称为 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:b8325660-7a21-4972-969c-e88b5bf54aac\" data-concept-route=\"/concept-identities#concept-b8325660-7a21-4972-969c-e88b5bf54aac\" id=\"first-a6eac3f03f429b257e85-zh\">黑洞(black hole)</u>。",
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        "quote": "$\\mathbf { A } \\mathbf { s } r  2 m$ the metric shows no abnormality in these coordinates. Inward directed timelike geodesics in the region $r > 2 m$ reach $r = 2 m$ in finite $v$-time (and also in finite proper time). However, after the geodesic particle crosses $r = 2 m$ no light signals can be sent ou from it into $r > 2 m$ (see Fig. 18.4). The surface $r$ 2$m$ acts as a one-way membrane for light signals, called an <u class=\"concept-term\" data-concept-identity=\"urn:uuid:9c94cffc-a155-4a23-9c2f-298515ef4d50\" data-concept-route=\"/concept-identities#concept-9c94cffc-a155-4a23-9c2f-298515ef4d50\" id=\"first-aae3a818b4ab5afa13ff-en\">event horizon</u>. Observers with $r > 2 m$ can never see any events inside $r = 2 m$ , an effect commonly referred to as a <u class=\"concept-term\" data-concept-identity=\"urn:uuid:b8325660-7a21-4972-969c-e88b5bf54aac\" data-concept-route=\"/concept-identities#concept-b8325660-7a21-4972-969c-e88b5bf54aac\" id=\"first-a6eac3f03f429b257e85-en\">black hole</u>.",
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