additional disk

例句：

1. 1. We need an additional pair of shoes for the trip.
   我们需要一双额外的鞋子来旅行。
2. 2. The company added a new department to its operations.
   该公司增加了一个新的部门到其运营中。
3. 3.The extra money will go towards paying off our debts.
   额外的钱将用于偿还我们的债务。