only child

US /ˈoʊn.li ˌtʃaɪld/
UK /ˈoʊn.li ˌtʃaɪld/
"only child" picture
1.

独生子女, 独生子, 独生女

a child who has no siblings

:
Being an only child, she sometimes wished for a brother or sister.
作为独生子女,她有时希望有个兄弟姐妹。
He grew up as an only child in a quiet neighborhood.
他在一个安静的社区里作为独生子女长大。