hand over hand

例句：

1. 1.They handed over the keys to the new manager.
   他们把钥匙交给了新经理。
2. 2.The children were handing over their toys to each other.
   孩子们互相交换玩具。
3. 3. They handed over the money to the bank.
   他们将钱交给了银行。