process distinguish stack number

例句：

1. 1. The engineer processes the raw materials into finished products.
   工程师将原材料加工成成品。
2. 2.The company processes orders and ships them out to customers.
   公司处理订单并发货给客户。
3. 3.The process of learning a new language is challenging but rewarding.
   学习一门新语言的过程既具挑战性又令人满足。