Definition 3 A universal cover of a topological space \(X\) is a covering space \(\tilde{X}\) of \(X\) that is simply connected, meaning that it has no nontrivial loops. The universal cover is unique up to homeomorphism and serves as a “universal” object in the category of covering spaces of \(X\).
经承运人证明，旅客的人身伤亡或者行李的灭失、损坏是因旅客本人的故意造成的，或者旅客的人身伤亡是旅客本人健康原因造成的，承运人不承担赔偿责任。
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