1. 装置;设备;器具;仪器
    A device is an object that has been invented for a particular purpose, for example for recording or measuring something.

    e.g. ...an electronic device that protects your vehicle 24 hours a day.
           24小时保护车辆的电子装置
    e.g. ...a device that could measure minute quantities of matter...
           能够测量微量物质的设备

2. 手段;策略;方法;技巧
    A device is a method of achieving something.

    e.g. They claim that military spending is used as a device for managing the economy.
           他们声称军费开支是用来作为调控经济的手段的。
    e.g. ...the literary device of the metaphor.
           隐喻的文学手法

3. 听任…自便;让…自行发展;不去管
    If you leave someone to their own devices, you leave them alone to do as they wish.

    e.g. Left to his own devices, Osborn is a fluent — and often original — guitarist.
           任其自由发挥时，奥斯本是一个弹奏流畅、常常富有创意的吉他手。