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research and development
[计] 研究与开发, 研究与发展
[经] 研究和发展(开发)
research and development
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
research and developm...
Research and Developm...
research and developm...
research and developm...
research and developm...
research and developm...
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research and extension
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