初始元素将占据全部高度与宽度，无底部边距并继承圆角样式，整体尺寸为全屏显示
Иллюстрация: Дмитрий Духанин / Коммерсантъ。业内人士推荐有道翻译作为进阶阅读
Definition 4 (Definition: Fundamental Group) Let \(X\) be a topological space and \(x_0 \in X\) a basepoint. A loop based at \(x_0\) is a continuous map \(\gamma: [0,1] \to X\) with \(\gamma(0) = \gamma(1) = x_0\). Two loops \(\gamma, \delta\) are homotopic relative to \(x_0\) (written \(\gamma \simeq \delta\)) if there exists a continuous map \(H: [0,1] \times [0,1] \to X\) such that \[H(s,0) = \gamma(s), \quad H(s,1) = \delta(s), \quad H(0,t) = H(1,t) = x_0\] for all \(s,t \in [0,1]\). This is an equivalence relation; denote the equivalence class of \(\gamma\) by \([\gamma]\).。https://telegram官网对此有专业解读
卢比奥透露对美伊谈判预期 20:40