Since 1967, over a thousand writers from more than 120 countries have attended the IWP at the University of Iowa.
自1967年以来，超过一千作家来自120多个国家参加了IWP艾奥瓦大学的。
2
The International uniform welder and welding practitioner (IWP) training guideline, examination standards provide the new model for training of welding practical personnel in China.