patent of addition

例句：

1. 1.The cost of the new product is an addition to the existing costs.
   新产品的成本是现有成本的一个增加。
2. 2. The teacher added a new lesson to the curriculum.
   老师在课程中增加了一个新的课程。
3. 3. The company added a new department to its staff.
   公司增加了一个新的部门到其员工队伍中。