第二个短横后数字为污秽等级号；

The second short after the digital for pollution level date;

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采用短横孔人工缺陷和平底孔人工缺陷的当量标定或用大平底当量计算法。

Equivalent calibrations of short horizontal hole artificially defects and big flat-bottomed hole artificially defects or calculation equivalent of big flat-bottom are adopted.

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首先，是“内景”或“外景”，然后是具体的地点，短横杠，“白天”或“夜晚”。

for exterior or "INT." for interior, followed by the actual location.

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