Finally, we suggested that the problem on stability of the bench mark may be settled in certain area by using the bench mark with a casing pipe buried in the proper depth of soil stratum.
最后指出，在某些地区，适当埋设深层套管水准标，可以解决水准标志的稳定性问题。
If the display of an object identification mark accurately follows up a moving object, the visibility of the mark may deteriorate.
如果对象识别标记的显示准确地跟踪运动对象，则标记的可视性可能恶化。
If the display of an object identification mark accurately follows up a moving object, the visibility of the mark may deteriorate.
如果对象识别标记的显示准确地跟踪运动对象，则标记的可视性可能恶化。
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