短語詞組短語Cover -layer 包封膜asphaltum concrete cover -layer 瀝青罩面層Primary Cover Layer 主要覆蓋層Secondary Cover Layer 輔助覆蓋層Deep cover layer 深厚覆蓋層metal cover layer 金屬包覆層cover layer window openings 覆蓋層窗口開口;包括層窗口;覆蓋層窗戶cover layer thickness 覆蓋層厚度capping cover layer 上部防護(hù)面層 返回 cover layer