I refuse to give shops my phone number so they can ring me with unsolicited offers.我拒绝把电话号码给店家，以免他们主动给我打电话推销。Britain's biggest phone company has taken to cold calling customers.英国最大的电话公司已经开始涉足电话推销业务了。She had worked as a call centre operator making cold calls for time-share holidays.她曾经在话务中心当过话务员，负责打电话推销分时度假。