[] an object or a piece of equipment that has been designed to do a particular job装置；仪器；设备◆a handheld device that functions as a mobile phone and an electronic map一种可以用作移动电话和电子地图的手持装置a method of doing sth that produces a particular result or effect手段；策略；技巧◆Sending advertising by mail is very successful as a marketing device.邮寄广告是一种十分成功的营销手段。