求翻译：一直以为，那些有关于机械工具的制造是非常容易的，又不实用，而且以为那些制造机器都不怎么值钱，今天一观，真的是让我学到了不少，改正了许多的错误想法！是什么意思？

Always thought that those on the manufacture of machine tools is very easy, nor practical, but that is not how valuable those manufacturing machinery, and today a concept, I really learned a lot, to correct a lot of misconception!

I always thought that to those who are on mechanical manufacture of tools is very easy to do, it is not practical, and think that those who are manufacturing machines aren't worth the money, a concept that today is really let that I have learned a lot of mistakes, corrected the many ideas!

Thought continuously that, these have about the machine tools manufacture is extremely easy, is impractical, moreover thought these manufacture machine all not how valuable, today a view, really was lets me learn many, corrected many wrong ideas!

Thought, those on the manufacture of machine tools is very easy, and not practical, and thought that those machines are not very valuable, Outlook Today, really is and I learned a lot, corrected many errors of ideas!

Thinking all the time, it was very easy that there was manufacture on mechanical tool in those, impracticable, and thought those made the machine not very costly, a view today, really let me study and correct a lot of wrong ideas much!