cold [ kEuld ] (adj.) not approached before 冷不防的

[例]  He gave me a cold call this afternoon but we didn’t have any appointment.

 collaboration [ kE7lAbE5reiFEn ] (n.) working together 协作

[例]  The efficient collaboration will bring mutual benefit to both sides.

 collective bargaining (n.) negotiations between unions and employers about conditions, wages, etc. 集体协定，劳资双方就工资等问题谈判

[例]  Labor union is making collective bargaining with employers of that factory.

 come up with =put forward (an idea) 提出

[例]  come up with an original idea

 commercial [ kE5mE:FEl ] (adj.) of or relating to commerce 商业的

[例]  commercial area

[同义词]  trading, mercantile

 commercial(n.) advertisements on TV or radio （电视插播的）商业广告

[同义词]  advertisement

[例]  The aim of the repetitions of the same commercial on television is nothing but to brainwash consumers into compulsive consumption.

 commercialize [ kE5mE:FElaiz ] (v.) make something make money使商业化

[例]  They have a good research reputation but they find it difficult to commercialize their products.