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The infinitely stacked world \(D^2 \times \mathbb{R}^2\) is the universal cover of Bobs world \(S^1 \times D^2\), as it is simply connected and covers Bobs world (see the definition of universal cover above).，更多细节参见新收录的资料
，更多细节参见新收录的资料
It comes shortly after the defence secretary reiterated president Donald Trump’s threat that if Iran does anything to prevent the flow of oil in the strait of Hormuz, it will be hit “twenty times harder”.。新收录的资料是该领域的重要参考
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