1(表示汽车发动机等的容量)立方厘米 You use cc when referring to the volume or capacity of something such as the size of a car engine. cc is an abbreviation for 'cubic centimetres'. (表示汽车发动机等的容量)立方厘米
...1,500 cc sports cars.
1,500立方厘米气缸的跑车
2(用于商业书信的末尾)抄送给,副本呈送cc is used at the end of a business letter to indicate that a copy is being sent to another person. (用于商业书信的末尾)抄送给,副本呈送