In industrial enterprises, employee training is very important. From a development point of view, it will become more and more important. Science and technology are developing rapidly, and production and manufacturing methods are undergoing rapid changes. Workers are facing the problem of improving their personal qualities to adapt to this change. What does this passage emphasize? ['At present enterprises do not pay much attention to employee training.', 'The rapid development of science and technology promotes continuous improvement and innovation of production and manufacturing technology.', 'Staff training is very important and must be continued.', 'With the development of science and technology, the quality of enterprise employees is constantly improving.']