若不采取措施，地面电位差足够大到可能危及在该处行走的人员。
Unless proper precautions are taken, the voltage differences along the ground may BE great enough to endanger a person walking there.
大量模拟计算表明，当混凝土的电阻率比土壤的电阻率小很多时，地面电位是在混凝土的边角附近变化最大。
A lot of analog data show that the ground potential varies most in the edge areas of the concrete when the resistance of the concrete is smaller than that of the soil.
利用这个探头，配合地面电位测试装置，能够方便地测量地下管道的各种参数，确保地下管道长期安全运行。
Utilizing this probe, combining surface potential measuring device, various parameters of underground pipe can be conveniently measured, insuring them safely working in a long time.
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