It is important to remember that the four-letter type code is more than the sum of four letters.

记住人格类型不只是四个字母的简单堆砌是很重要的。

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Overlying strata spatial structures of longwall formed by working faces that is mined and four sides are substance coal are named "o" letter type spatial structures.

我们把一面采空(四周为实体煤)形成的采场覆岩空间结构称为“O”型空间结构。

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Overlying strata spatial structures of longwall formed by working faces that is mined and four sides are substance coal are named "o" letter type spatial structures.

我们把一面采空(四周为实体煤)形成的采场覆岩空间结构称为“O”型空间结构。

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