像arm in arm,hand in hand,face to face这样“器官+介词+器官（和前面的器官相同）”的词组都有什么?
问题描述：
像arm in arm,hand in hand,face to face这样“器官+介词+器官（和前面的器官相同）”的词组都有什么?
答
shoulder to shoulder
mouth to mouth
back to back