| concurrent | 并发的；协作的，一致的 |
| curriculum | 学校的全部课程 course, program |
| cushion | 垫子，软垫 缓和...的冲力，保护 |
| a cushion of | 一层 |
| air-cushion vehicle | 气垫船 |
| custodian | 看守人，管理人 curator, guardian |
| custom | 习惯，传统，惯例 tradition, practice |
| customs | 关税 |
| customer | 消费者 patron, clientele |
| customarily | 通常 usually, habitually |