X-datum line Y-datum line 穿孔卡片基准线
Given a regex and a datum, a regex engine yields whether the datum matches a pattern and, if a match was found, what matched.
给定一个正则表达式和数据，正则表达式引擎将得到数据是否匹配模式及匹配内容(如果找到匹配)等结果。
Often, it is something global like WGS-84 (World Geodetic System 1984, used by all GPS devices), or a regional datum like NAD-83 (North American Datum 1983).
它常常是全球大地基准点（比如 WGS-84，即 World Geodetic System 1984，由所有 GPS 设备使用），或地区性大地基准点（比如 NAD-83，即 North American Datum 1983）。
This paper expounds in theory that, we may use the relative stability or their ratio caused by UNVARIABLE as the proportion of the point on datum, which accords with the demands for choice of datum.
本文从理论上阐明用不变量导出的相对稳定度函数或其比值作为点在基准中的份量是符合对基准选择之要求的。
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