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）。
By means of watching video and statistics, studying literature datum, the author analyzed the characteristics of Man's Horse-vaulting in the world at present.
采用文献资料、录像观察统计等方法对当今世界男子体操跳马特征进行了研究。
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