bitterness  
noun [ U ] uk/ˈbɪt.ə.nəs/ us/ˈbɪt̬.ɚ.nəs/
  (TASTE)     
  苦味
an unpleasantly sharp taste
   (ANGER)      
 愤怒;怨恨
a feeling of anger and unhappiness
  He was full of bitterness after he lost his job. 丢了工作后,他满肚子都是怨恨。 
 
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