在每一个位置把测试区域与参考区域的表面做比较。
In each position compare the test area with the surface of the reference area.
通过参考区域土层物理力学性质资料，结合工程经验获取参数值，预测结果的精度得不到保证。
Meanwhile the accuracy of results can not be guaranteed, if the value of parameters is determined through referencing regional soil's physical mechanical information.
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