machine在牛津词典中的解释是：“a piece of equipment with moving parts that is designed to do a particular job. The power used to work a machine may be electricity, steam, gas, etc. or human power.”也就是常说的“机器，机械装置”。
eg. I use this machine to plant many potatoes.
我用这台机器种许多土豆。
machinery的英文解释为“machines as a group, especially large ones”， 即“机器的集合、总称，尤其指的是——大型机器”。
eg. German factories supply machinery , vehicles and technical facilities - a constantly growing amount of exports.
德国工厂提供机械，车辆和技术设施-其出口量不断增长。
1. machine是动力运转的一部机器，而machinery是一套机械系统，尤其指的是大型机械。
eg：The machinery in the mask factory consists of several different kinds of machines.
口罩工厂里的机械设备包括许多种不同的机器。
2. machine是可数名词，machinery是机器的总称， 是不可数名词。
eg. A washing machine will save you lots of time.
洗衣机会节省你很多时间。
As a mask manufacturer,how many pieces of machinery does your factory need?
作为口罩生产商，你的工厂需要多少台机器？
四、mechanic
mechanic指的是“a person whose job is repairing machines, especially the engines of vehicles”也就是“机械师；机械修理工”，指的是“人”。
eg.Since his father was a car mechanic , he kept plenty of tools in the garage.
由于他的父亲是汽车修理工，所以他在车库里放了很多工具。
machine 机器
machinery 大型机械
mechanic 修理机械的人，机械师，修理工
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