copyright (n) an exclusive legal right, for a certain number of years , to print, publish, record, perform, sell and original text ,work of art or design 版权

[例] China should reinforce her law to punish infringement of copyright.

copywriter (n.) person who writes copy for advertisements etc.广告文字撰稿人

core time (n.) period of working day when all employees must be at work 固定工作时间(see also flexitime)

[例] However, you must all be here for core time from 10 till 3.

corporate (adj.) referring to the whole company法人组织的

[例]  Corporate advertising sells the company, not its products.

correspondence (n.) communication by the exchange of letters通信，商务信函

[例]  Correspondence can be a key to success.