研究证明：四种型号品牌的碳素笔其拉曼光谱有相似之处， 但更有明显的不同；
The Raman spectra obtained in the experiments indicated that four brands of carbon pen have not only similarity but also differentiation.
其他品牌和型号的微机在外貌和操作上各有不同。
Other brands and models of microcomputers exhibit difference in appearance and operations.
你在试图解决问题时，常常需要知道你电脑的硬件的确切信息：品牌和型号，有时还有版本标示。
Many times when you are trying to solve a problem, you need to knowexactly what hardware is in your computer: what brand and model, and sometimes,revision level.
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