covering manifold
... covering homotopy theorem 覆盖同伦定理 covering manifold 覆盖廖 covering map 覆盖映射 ...
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通用覆盖廖 universal covering manifold
无限覆盖廖 unlimited covering manifold
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1982年，廖内省森林覆盖率超过四分之三，现在，仅有约四分之一。
In 1982 more than three-quarters of Riau was forested. Only about a quarter is now.
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