undercoat [ˈʌndərkoʊt]

例句:

• Cashmere: Animal - hair fibre forming the downy undercoat of the Kashmir goat.
  山羊绒: 构成喀什米尔山羊绒毛层的动物纤维,属于特种动物毛纤维.
  
• It is a hard , wiry outer coat with a soft, dense undercoat.
  外层披毛为刚毛, 毛质硬,内层底毛柔软浓密.
  
• HAIR: Medium length, straight with dense undercoat, never soft, wavy or wiry.
  毛质: 中等长度, 直,底毛密, 不可以软 、 成波状或丝状.
  
• By eight o'clock the undercoat was on most of the front wall.
  来自NEWYORKER
• Sure, son, but first, slap some undercoat on that tree.
  来自THETIMES
• It was covered in fur, with an outer covering of long guard hairs and an inner covering of shorter undercoat.
  来自BBC