... undersea海面下的 undersealing底封 underseam底部煤层 ...
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undersealing course 下封层
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同义词: undercoat
以上来源于: WordNet
N a coating of a tar or rubber-based material applied to the underside of a motor vehicle to retard corrosion (给车底涂的)防水材料 (US name undercoat)
V to apply a coating of underseal to (a motor vehicle) (给车底)涂防水材料
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