mat·tress /ˈmætrəs/
 床墊,空氣墊,沈床


 Mat·tress n.
 1. A large pad stuffed with hair, moss, or other suitable soft material, and quilted or otherwise fastened, used as or in a bed, to support the human body while lying down. [Written also matress.]
 2. Hydraulic Engin. A mass of interwoven brush, poles, etc., to protect a bank from being worn away by currents or waves.

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 mattress
      n : a large thick pad filled with resilient material and often
          incorporating coiled springs, used as a bed or part of a
          bed