A characteristic arrow point was found and first described near the present day town of Clovis, NM.
一个典型的箭头在今天的新墨西哥的克洛维斯镇被发现，这是第一次有描述。
On the basis of introduction of run and nm materials, the specific properties of run building materials difference from traditional materials and present applying situation are expounded.
介绍有关纳米知识的基础，阐述几种纳米建材有别与传统建材的特性及其应用现状。
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