A difficult middle child:
A middle child who exhibits challenging behaviors or faces unique difficulties within the family dynamic. This can stem from feelings of being overlooked or neglected, as middle children may not receive the same level of attention as the eldest or youngest siblings.
“A difficult middle child” 指的既不是兄弟姐妹当中的老大，也不是老小，而是那个夹在中间总爱闯祸、难管教的孩子。
人们猜测，“a difficult middle child” 所指的这类孩子因为年龄在兄弟姐妹当中不上不下，既没有老大的姿态，也不像老末那样受尽宠爱，所以他们的不良行为可能是由于感到被人忽视和嫉妒引起的，而惹事也许是想从父母或权威人物那里得到更多关注的一种方式。
例句
Clara has an older and younger sister and always got into loads of trouble at school. Her sisters never behaved badly – she was definitely a difficult middle child!
克莱拉有一个姐姐和一个妹妹，她上学时总是闯祸。她的姐妹们从不调皮捣蛋，她的确是姐妹中间那个难管教的老二！
My parents always said my brother was a difficult middle child because he was so naughty. I thought he was so cool, though!
我父母过去总说我哥哥是夹在兄弟姐妹中间那个难管教的老二，因为他太淘气了。不过那时我倒是觉得他很酷！
I was a really difficult middle child, but now I have children of my own, I feel really bad about how I used to behave!
我小时候是个很难相处的老二，但现在有了自己的孩子后，我对自己过去的行为感到很愧疚！
