With the high speed development of our technology, machine, as our efficient tool, has dramatically promoted social progress and liberate human conventional hand-working industry. To begin with, compared with doing work by hand, using machine is an effective way to help people deal with many tough things. Taking computer an example, searching files, this function I always use, is helping save much time for me. When I need some information about my essay, definitely I will search in internet. Almost everything I can download from internet and only several hours, material collection can be finished. While if searching files in conventional way, I mean, from laboratory by hand, it is hard to say. First, you have to go to laboratory, and find the books which you do not know it has the useful information for you or not. Sometimes it will spend you a whole day just finding some documentaries, and maybe you don't have enough yet. What's more, when I write my essay in computer, the spelling mistakes can be corrected automatically, which saves my time, too.  Moreover, all kinds of resources are less enough because of the increasing of human population, which is to say, machine is indispensable in our life because of its high efficiency. Now let's talk about Milk which is the high demand production in every family. In the past, milk is collected by hand. The weakness of this traditional way is inefficient and not sanitary. Besides, it needs many workers and takes too much time. But in nowadays, milk industry is controlled by machines automatically. From the breeding cattle to collecting milk is governed by machine, human is a small part in this progress, which promotes milk efficiency and saves labor resource.  There is no doubt that work by hand has its advantage. In the physics Class I remember teacher told us to build a hammer by our hands, it is a challenge for all of us. You have to organize the hammer model first, then how to sharpen is effective way. In the end, no matter the hammer is good or not, we all taste a kind of achievement and the progress is interesting. But if in the industry, all hammers are made by hands, what is a terrible thing! In conclusion, although some industries remain rely on human hand-working, such as interior decoration. I believe in the later years, machine can replace them. Because machine is changing the world in every corner and will continue to be.