Warning: file_put_contents(/www/wwwroot/ppbbu/bieo.cn/cache/bef8eb62af764d6ce366d16666683b47.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/bieo.cn/index.php on line 58 research and development英英字典_research and development剑桥英语解释_research and development柯林斯英文解释_衣物护欧路词典
1. N the part of a commercial company's activity concerned with applying the results of scientific research to develop new products and improve existing ones 研究与开发 ( abbr: R & D)