它是冻土地区特殊的工程地质现象。
It is a special engineering geological phenomenon in the frozen earth region.
广州新白云国际机场地基中广泛发育土洞、溶洞等不良工程地质现象，地基条件极其复杂。
There are harmful engineering phenomena of earth caves and karst caves widespread in foundation of the New Baiyun International Airport, Guangzhou, so the foundation condition is very complex.
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