mouth·ful /ˈmaʊθˌfʊl/
  一口,滿口
  Mouth·ful n.; pl. Mouthfuls
  1. As much as is usually put into the mouth at one time.
  2. Hence, a small quantity.
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  mouthful
       n 1: the quantity that can be held in the mouth
       2: a small amount eaten or drunk; "take a taste--you'll like
          it" [syn: taste]