Simpleness appears not only in the form of the building but also in the moderate application of the restricted assortment of the natural and artificial materials.

简单不但表现在建筑的形状，也表现在适度应用种类有限的自然和人工材料上。

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Abrasives source of their raw materials, there are two kinds of natural abrasive and artificial abrasives.

磨具按其原料来源分，有天然磨具和人造磨具两类。

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Modifications of graphite materials for negative electrode of lithium ion batteries were reviewed. Natural graphite, artificial graphite and graphitic carbon fiber were discussed.

综述了用于锂离子电池负极的石墨材料的修饰与改性方法，所研究的石墨材料包括天然石墨、人造石墨和石墨化碳纤维。

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