同母异父姐妹

例句：

1. 1. She is the only child of her parents, but she has two half-siblings who are not biologically related to her.
   她是她父母的唯一孩子，但她有两个半兄弟姐妹，他们不是生物学上的亲属。
2. 2. Her mother and father divorced when she was young, so she has no biological siblings.
   她的父母在她还小的时候就离婚了，所以她没有生物学上的兄弟姐妹。
3. 3. Despite their different biological parents, they share a close bond and often visit each other's homes.
   尽管他们有不同的生物学父母，但他们关系亲密，经常互相拜访。