stepsister
n. (继父与其前妻或继母与其前夫所生的)姐姐,妹妹
Someone's stepsister is the daughter of their stepfather or stepmother.
1. a sister who has only one parent in common with you
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.
She was also going to have a new stepsister.
她也将有个新姐姐.