stepsister [ˈstɛpˌsɪstɚ]

例句:

• "God knows where I'll be in a year, " Goldman tells his stepsister at her bat mitzvah.
  来自CNN
• She was also going to have a new stepsister.
  她也将有个新姐姐.
  
• One afternoon, Jenny was straightening up her room when her stepsister, Alice, walked in.
  某天下午, 珍妮正在整理房间时,她的新姐姐爱莉丝走了进来.
  
• Isobel Dobson was in the van with her one-year-old stepsister when the fire broke out at a stables.
  来自THETIMES