A filled torus (a doughnut) is a 3-manifold homeomorphic to \(S^1 \times D^2\), where \(D^2\) is the 2-dimensional disk. There exists a deformation retract from the doughnut to a circle, so the fundamental group of the doughnut is \(\pi_1(S^1 \times D^2) \cong \mathbb{Z}\).
国外特斯拉Optimus V3虽然确定于今年Q1发布,并喊出年底10万台、远期100万台的宏伟产能,目标售价直指2万美元,但其时间表已较原计划推迟了约8个月。
,这一点在同城约会中也有详细论述
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