研究与发展 yánjiūyǔfāzhǎn research and development Definitions Defs Origin Strokes Stroke Words Sentences Sents 研究与发展 研究與發展 yánjiūyǔfāzhǎn research and development research and development; often abbreviated as R&D
研究与发展 研究與發展 yánjiūyǔfāzhǎn research and development research and development; often abbreviated as R&D
