twin jack

例句：

1. 1. The twins are identical in appearance and personality.
   这对双胞胎在外貌和个性上都是一模一样的。
2. 2.They have two children, one of whom is a twin jack.
   他们有两个孩子，其中一个是双胞胎。
3. 3. The twin jack has been adopted by a loving family.
   这个双胞胎被一个充满爱心的家庭收养了。