1. To apply an undercoat to. 
   给…加内涂层给…上内层涂料（底部防锈层）
2. Himalayan goat having a silky undercoat highly prized as cashmere wool. 
   喜玛拉雅山羊，底层绒毛柔滑如丝被赞为克什米绒毛。
3. An undercoat of paint or size applied to prepare a surface, as for painting. 
   底漆，涂底料油漆之前，涂在某一表面上作准备的底漆或涂料
4. The soft, fine undercoat of certain mammals, such as otters, beavers, and seals. 
   细软绒毛水獭，海猩和海豹等哺乳动物的底层细软绒毛
5. To prepare(a surface) for painting by covering with size, primer, or an undercoat. 
   在…上涂底漆在（某一表面）涂上底漆、底色或胶料以便油漆

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