... elevation of in-door grade 室内地坪标高 elevation of level ground 室外地面标高 elevation of main building area 主厂房区标高 ...
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It infers the location of the underground river system by joining the lowest points from ground-level elevation measurements, Hutchinson said.
Hutchinson说，它可以通过连接地水准面的最低点来推测出地下河流系统的位置。
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