only child
the only child in one's family 都有 独生子女 的意思.具体的看上下文了.
singleton 也可以,不过就是独生子的意思.
例：过分溺爱独生子女的父母
Parents who dote on their only child.
独生子女有时被宠坏了.
Only children are sometimes spoilt.
在新中国,父母必须把全部希望寄托在独生子女身上,于是教室,而不是田地,就意味着前途.
In New China,parents must pin all of their hopes on one child,and classrooms,not fields,are the future.
