semifinal       
noun [ C usually plural ] uk/ˌsem.iˈfaɪ.nəl/ us/ˌsem.iˈfaɪ.nəl/ (informal semi)
B2 半决赛
one of the two games that are played to decide who will take part in the final game of a competition
  Who's in the semifinals? 谁进了半决赛? 
 She's the youngest player ever to get through to/advance to a semifinal. 她是闯入半决赛的最年轻的选手。 
 - More examples
 - The semifinal will be played on Saturday.
 - They're through to the semifinal.
 - She's done really well to reach the semifinal.
 - England were beaten 3-0 by France in the semifinal.
 - She was knocked out in the semifinal.