single split

例句：

1. 1.This is my only copy of the book.
   这是我这本书的唯一副本。
2. 2. She has a single sister.
   她只有一个妹妹。
3. 3. The single mother had to work two jobs to make ends meet.
   这位单身母亲不得不做两份工作来维持生计。