rigorous research and development
After long-term, rigorous research and development, KMC Chain presents the color chain for multiple-speed use!
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rigorous research and development
严谨的研发
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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After long-term, rigorous research and development, KMC chain presents the color chain for multiple-speed use!
经过长期，严谨的研究和开发，桂盟链条呈现的颜色多速度使用！
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