expression  
noun uk/ɪkˈspreʃ.ən/ us/ɪkˈspreʃ.ən/
  (SHOWING)         
 B2 [ C or U ]表示;表达;表露 
the act of saying what you think or showing how you feel using words or actions
  He wrote her a poem as an expression of his love. 他给她写了一首诗以表达爱慕之情。 
 We've received a lot of expressions of support for our campaign. 我们收到很多来信表示支持我们的运动。 
 Freedom of expression is a basic human right. 言论自由是基本的人权。 
 It's better to give expression to (= show) your anger, rather than hiding it. 最好把愤怒发泄出来,而不是深藏于心。 
formal His sadness at the death of his wife found expression (= was shown) in his music. 他通过音乐表达了对亡妻的哀悼之情。 
 She plays the violin with great expression (= feeling). 她的小提琴演奏很有表现力。 
 B2 [ C ]表情;神色 
the look on someone's face, showing what they feel or think
  I could tell from her expression that something serious had happened. 一看她的脸色我就知道出了很严重的事情。 
 Mark always has such a miserable expression on his face. 马克脸上总是带着一副苦恼的神情。 
 - More examples
 - I could tell from his grim expression that the news was not good.
 - He listened to the music with an expression of pure rapture on his face.
 - She looked at him with a surprised expression on her face.
 - Modernism seeks to find new forms of expression and rejects traditional or accepted ideas.
 - In this role, Durante is able to give full expression to that wonderfully virile voice.
 
  (WORDS)      
 B2 [ C ]词;词语;措词 
a word or group of words used in a particular situation or by particular people
  He uses a lot of unusual expressions. 他总是用很多生僻的字眼。 
 "A can of worms" is an expression that means "a difficult situation". A can of worms这个短语的意思是“棘手的局面”。 
 - More examples
 - The expression "boy band" was coined in the 90s.
 - There is no English equivalent for 'bon appetit' so we have adopted the French expression.
 
  (NUMBERS)      
 [ C ](数学中的)式,表达式 
in mathematics, a symbol or group of symbols that represent an amount
  4xy2 is an expression. 4xy2是一个表达式。