trial produce就是试制的意思。We carried out trial produce by using the new material in order to test its usability. After a successful trial produce, it will be produced in batch size.
Research and developmentR&D research and development [简明英汉词典]n. (产品等的)研究与开发R&D Institution (Research & development) R&D [简明英汉词典]abbr.[军] Research and Development, 研究与发展abbr.Research and Development ,研究开发