stepsister
n. (繼父與其前妻或繼母與其前夫所生的)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, 珍妮正在整理房間時,她的新姐姐愛莉絲走了進來.
She was also going to have a new stepsister.
她也將有個新姐姐.