In GPS surveying, we usually need to compute closure difference of triangle or polygon, so as to search surveying gross errors and estimate GPS observing precision.
在GPS测量中，往往需要计算三角形、多边形闭合差，以便及时发现观测粗差、衡量GPS观测精度。
The big difference is that we don't use any properties of the object within the closure, since it is defined as static.
最大的差别是在闭包内不使用对象的任何属性，因为它被定义为静态类。
The only difference between this and the standard list closure is the addition of the lastUpdated field.
这个闭包与标准的 list 闭包之间惟一的不同是增加了 lastUpdated 字段。
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