underlay

名词 underlay:

1. a pad placed under a carpet
   同义词：carpet pad, rug pad, underlayment

动词 underlay:

1. raise or support (the level of printing) by inserting a piece of paper or cardboard under the type
2. put (something) under or beneath
3. provide with a base, support, lining, or backing

动词 underlie:

1. be or form the base for
   同义词：underlie
2. lie underneath
   同义词：underlie

1. Paper or other material used to underlay.
   衬垫用于下衬的纸或其它物质