... 覆盖的范围 coverage 覆盖的加细 refinement of a covering 覆盖的区域 area of coverage; coverage area ...
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覆盖的加细
The covering is fine
以上为机器翻译结果，长、整句建议使用 人工翻译 。
空间X是几乎亚紧的当且仅当X的每一单调开覆盖U有一个开加细，且在X的某一稠密子集上是点有限的；
A space X is nearly metacompact if and only if every monotone open cover U has an open refinement that is point-finite on some dense subset of X;
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