mechnism, device, equipment等等设备,装置之类的词区别是什么,词义大小?

mechnism, device, equipment等等设备,装置之类的词区别是什么,词义大小?

mechanism
/ ˈmekənɪzəm; ˋmɛkəˏnɪzəm/ n
working parts of a machine,etc 机械装置:a delicate watch mechanism 精细的手表机件 * the firing mechanism of a rifle 步枪的击发装置.
parts of an organism or system which work together （机体或装置的）结构,构造:the mechanisms of the body 身体的结构.
method or procedure for getting things done 手法; 技巧; 程序:There are no mechanisms for transferring funds from one department to another.基金无法从一部门转移至另一部门.
device
/ dɪˈvaɪs; dɪˋvaɪs/ n
thing made or adapted for a special purpose （为某种用途而制作或改装的）装置,器具:a device for measuring pressure 测压装置 * a labour-saving device 节省劳力的装置 * an explosive device 爆破装置 * a nuclear device,eg a nuclear bomb or missile 核子装置（如核弹或核导弹）.=>Usage at machine 用法见machine.
(literature 文学) metaphor,combination of words,etc used by a writer to produce an effect on the reader （作者用以感染读者的）手法,技巧（如隐喻、 词语搭配等）:a stylistic device 文体表现手法.
scheme; trick 策略; 计策; 诡计; 计谋:Her illness is merely a device to avoid seeing him.她所谓生病只不过是避免见他的花招而已.
symbol or figure used as a sign by a noble family,eg on a crest or shield （贵族用作家族标志的）图案（如用於饰章或盾形徽的）:a heraldic device 纹章图案.
(idm 习语) leave sb to his own devices => leave1.
equipment [e'quip·ment || -mənt]
n.装备,才能,设备品
总体对比来说,mechanism是机械的总称,一般不指小型的具体的某个东西.
device是设备的总称,指的是那些具体的小型的,由具体功能的元器件和产品.equipment也是个集合名词,指装备,和device用法差不太多.