mixer  
noun uk/ˈmɪk.sər/ us/ˈmɪk.sɚ/
  (MACHINE)      
  [ C ]搅拌器;搅拌机 
a machine that mixes substances
  a cement mixer 水泥搅拌机 
 an electric (food) mixer 电动(食物)搅拌器 
   (DRINK)      
  [ C ]调酒用的饮料 
a drink that does not contain alcohol and can be mixed with an alcoholic drink, especially a spirit (= strong alcoholic drink)
  We have ginger ale, tonic water, and various other mixers. 我们有姜味汽水、奎宁水和其他各种调酒饮料。 
   (SOCIALIZE)        
a good/bad mixer mainly UK 善于/不善于交际的人
someone who is good/bad at meeting new people and talking to them
  You get to know lots of people at college if you're a good mixer. 如果你善于交际,在大学里会认识许多人。 
 Ben's a good mixer and loves a party.
 He's a nice guy but he's not an especially good mixer.
 Shall we invite Millie to the party? Is she a good mixer?
 Her school report mentioned that she was a good mixer.
 She's a very nice person but, alas, a bad mixer.
  US old-fashioned(旨在让人们相互认识的)舞会,晚会 
a party or dance that has been organized so that people in a group can get to know each other
  The school always holds a mixer on the second week of the term. 学校通常在学期开始的第二周举行舞会。