... 地面目标 place mark 地面起伏 accident of ground 地面强度 field intensity ...
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accident of the ground 地表皱褶
Historical accident put one of the world's biggest cities (23m) on such dangerous ground.
是历史偶然将这个世界上最大城市之一(2300万人口)放在了这么危险的地方。
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Sections of a drill which broke through the roof of a rail tunnel came from a construction site above the ground, accident investigators have found.
BBC: Construction drill came from site above rail tunnel
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