equipment 装备 device 仪器 instrument 器具（也是乐器的意思哦！） tool 工具 这些词本来很难分，然后英文也把它们之间的区别弄掉了。 device和tool 差不多. 我觉得tool可以说是你亲手用的那种工具，比如"I used a tool to pry open this box" 这个tool大概是螺丝刀、铁锹等工具。 device。。好像要“开启”才能用的仪器把。。比如"I placed a tracking device on the police car"（我在警察车上放了个跟踪仪器） "The airplane's safety device started beeping." (装在飞机上的安全仪器开始发嘟嘟声) instrument 我想到的就是医用的器具（比如钳子），也有instruments of mass destruction 大规模杀伤性武器、instruments of torture 刑具。 equipment 就是装备啊，有时也是设备的意思。equipment 比较大，比如说坦克零件、摄影机零件等等。

A tool is something used for a work purposes. For example, a hammer, pliers, etc. A device is something more technological, like a computer is a device, a calculator is a device. An instrument is a tool that is used for something very specific, like tools that a doctor would use in surgery. Equipment is a word that covers a broad range of things and can be used to describe all of the above words. Like "computer equipment