erode the base or foundation of (a rock formation)
侵蚀(岩层)底基。
dig or excavate beneath (a building or fortification) so as to make it collapse
破坏(建筑,要塞)底基。
暗中破坏;逐渐削弱
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this could undermine years of hard work .这会破坏多年的辛勤劳动。
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