For the Poincaré half-space model in dimension 2, the metric evaluates on the coordinate tangent vectors \(\frac{\partial}{\partial x}, \frac{\partial}{\partial y} \in T_pM\) as \[g_p\!\left(\frac{\partial}{\partial x^i}\bigg|_p,\;\frac{\partial}{\partial x^j}\bigg|_p\right) = \frac{1}{y^2}\,\delta_{ij},\] i.e. the coordinate tangent vectors are orthogonal and each has length \(\frac{1}{y}\) — shrinking to zero as \(p\) approaches the boundary \(y\to 0\), which is what makes the space “infinitely large” near the boundary.
招生数据佐证了这一趋势。《2024年全国教育事业发展统计公报》显示，2024年全国普通高中招生1036万人，这是中国普高招生首次突破千万大关。2025年，这一数字进一步增至1074.9万人。
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Ian YoungsCulture reporter
Марина Совина (ночной редактор)
using characters instead of path segments.