http://mises.org/Community/blogs/dp/archive/2009/06/28/economics-in-one-lesson-7-the-curse-of-machinery-4-3-4.aspx第7章 机器之祸 （接前面部分） 3 Not all inventions and discoveries, of course, are “labor-saving” machines. Some of them, like precision instruments, like nylon, lucite, plywood and plastics of all kinds, simply improve the quality of products. OthersenCommunityServer 2008.5 SP2 (Build: 40407.4157)